IOE Insights

High school teacher Mustafa Sakarwala speaks with Nandini Adusumilli (PhD student at Sleep and Education Research Lab at UCL) about why sleep is a core foundation for children’s and teenagers’ attention, learning, and exam recall.

Full show notes and links: https://www.ucl.ac.uk/ioe/news/2026/mar/sleep-memory-and-academic-performance

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You're listening to IOE Insights.

The UCL Institute of Education podcast

from University College London

Today uh so I wanted to talk to you

about the importance of sleep

especially in children in their

developmental years and I think it makes

a huge difference in the way they

perform in their school life and in

their daily lives. So I wanted to ask

you since you're a teacher with so much

experience. Do you think sleep is

important for children and their

academics?

Very important. I recommend that

students should sleep for at least 8

hours and if you are a teenager you know

18 19 years 6 hours is good enough but

for a schoolgoing student 8 hours of

sleep is highly recommended. What

happens is you know your mind starts

working when you're sleeping. So

whatever you study throughout the day,

the data you've taken in okay that

starts getting assimilated and processed

while you're sleeping. So if you're

sleepd deprived then it's very difficult

to produce it back for the exam the next

day. Also you know on a normal routine

day it affects your reception and your

learning.

That's that's absolutely right sir. When

you look at a childh,

how can you tell that okay this child

came into the classroom today and hasn't

slept and he looks so tired? Because

more often children these days are doing

allnighters before exams. It's a very

common thing especially in children who

give exams correct competitive exams. Um

in India especially we just had our

board exams and they were on caffeine

all night. And so when you're looking at

a child, how can you tell that okay this

child is tired?

Uh what I've noticed in experience is

that uh students who are sleepd deprived

uh generally will have a little they'll

be low on energy. Uh puffy eyes. They

feel groggy throughout the day. They'll

be quite inattentive in class and uh you

know they're not able to focus. So even

when you're teaching and you're

questioning them, they're not able to

answer back very effectively. And also

you know during a classroom session we

have you know uh periods where we make

them learn things in the middle of the

class like math formulas or certain

important definitions and certain

pointers you want them to remember. So

students who are sleepdeprived normally

are not very active to respond back and

it's very easy for a student for a

teacher to identify that the student is

sleep deprived. What I have noticed is

people who tend to have procrastination

issues don't study throughout the term

don't have a slur process and they feel

at night before an exam they can stay up

all night and they study and they feel

all confident and they go into the exam

and that's it. They're fully blank and

they're not able to recall some of their

concepts. So someone who's had an

experience with memory as well. What do

you think about memory recall and sleep

when it comes to students?

Wow, that's a nice interesting question

and uh one should remember that Rome was

never built in a tape what you memorize.

Okay, if you if you have to recall the

next day, you may remember 80%. So as

the days go by, the retention goes on

reducing. It's as simple as this. You

watch a 2hour movie and you have to come

and narrate a story to a friend after

the movie. You may even take 25 30

minutes to narrate the whole movie. But

the same movie has to be narrated after

1 week or 15 days. You finish the

narration in just about 5 minutes 3

minutes. Why? Because you're not being

able to retain enough. Now if you have

to retain that movie for a longer period

of time, it means you have to go on

watching and viewing it again and again.

So the same thing goes with studying. So

if you are studying something if you to

revise it the next day or after 3 4 days

your retention increases. Now students

who believe that oh I can study one day

prior to exam and I can do it. It may

work for a lower standards but doesn't

work for higher standards you know and

the students you know normally you know

when you interview people who have

topped exams and you ask them they will

always try to be humble and they say oh

I just began studying one month prior

and I did it. Believe me that's not the

true story. they have been studying

regularly and religiously and that's how

the academic performance excels

for children who are giving their exams.

What would you recommend their routine

looks like?

Wow.

So I have personally noticed that most

children who are giving exams they think

focus and hard work means that they have

no other extracurricular activities. It

means that they are cutting down on

their sleeping time timets. So they may

think that okay I'm going to wake up at

4:00 a.m. and work so hard but what most

people don't realize is that their brain

is slowly getting tired. So what they're

actually spending so many hours learning

they're not actually retaining it

all because of a simple thing like so

wow now see um one I recommend 8 hours

of sleep which is important two

uh I mean either you're a late night

sitter or you are you know early morning

now this may work differently for

individuals

I personally recommended a person you

know hits off the bed by at least by

about 11:00 gets up in the morning at

about uh 6:00 7:00. So you have your 8

hours of sleep. Now if you think that

you can sit up till 2:00 and study and

you get up early in the morning and then

you catch up back for the afternoon

sleep, it doesn't work. Night sleep is

the best form of sleep to increase your

retention and learning power. Now if you

deprive yourself of night sleep, then

you're depriving yourself of deep and

strong learning. So night sleep is

important. Uh you cannot study a day

prior to any exam. You have to be

studying much in advance. Early morning

should be used for regular revision.

Revision does not mean studying all over

again. It means you know you have your

certain pointers and you're recalling

those pointers. Okay. Just to make sure

that you remember things very well. To

add on to what you're saying, sir, um

many children and many working adults as

well have this idea of catching up on

sleep.

I've been looking at a lot of research

studies and there is no such thing as

catching up on sleep.

Correct.

Of course, you can

sleep longer later and give your body

the rest that it needs.

But there is no such thing as I'm going

to exert myself during the day and catch

up on the weekend. Yes,

this is we may not see it now especially

in young children but as you grow older

these may translate into diseases such

as diabetes,

heart problems,

anxiety, depression so many more you

know

it's very interesting that you touched

upon mental health you use the word

anxiety and depression

so do you notice that schoolgoing

children giving exam who are not

sleeping and who are very severely

stressed do you notice depressive

symptoms do you notice exam anxiety. As

a teacher, what would you say uh

children do to deal with this and how

would you guide them?

Very good.

What I recommend is physical activity.

Students must spend at least an hour or

two on some kind of physical activity.

So that that's where games come into

play. Uh if they are not having enough

time to play a sport,

yeah,

cycling, running is recommended.

Sleep of course as you mentioned

earlier. Now students you know keeping

in mind their routine life, their

school, their extra tions and

extracurricular activities must plan in

such a manner that there is enough scope

for games.

When students play games those good

hormones are released which help you

studying far better learning far better

retention and then better reproducing in

the exam as well. So games are very

important. Um if they can have uh you

know to relax their mind some kind of

light music it works but music should

not be something which you know makes

you very energetic it should be

something what calms and s you down so I

recommend music simple music games food

plays a very important role uh if you're

over stuffed it's very difficult to

learn you're over stuffed it'll again

trigger asleep at a wrong time. So what

I recommend is that when you are hitting

the bed especially during examination

time you take a lightamine which is the

in your stomach.

Most children uh who come back tired

from school uh think that it's great to

take a quick nap or squeeze in a quick

nap before they continue studying. So

most children especially in India their

schedules end about 4:30 and they're

sort of having a nap around 4:30 to 5 in

the evening which in my opinion

completely disrupts the quality of sleep

they're having later in the night. I

think that a nap should not be more than

20 minutes. Correct. And it should be

somewhere between 12 to 1:30 or 2.

Correct. Because at 4:30 to 5:30 is a

peak productive period.

That's right.

So that should be capitalized for

learning.

That can also be used for bleeding.

Yeah,

but definitely not for sleeping.

Sleeping can be around 1:30 2:00 and as

Nandini says 20 minutes max is enough.

You don't need an hour or 2 hours of

sleep in the afternoon. That's just to

relax your body.

Yeah. And that's for children and for

adults and working professionals. It's

actually been recommended to if it's

possible to skip any sort of daytime

sleeping to have a better quality of

sleep at night.

Perfect. In India, we have this sort of

culture that it's good to sort of go

into a deep sleep after having lunch.

Afternoon siestas.

Yeah. And most people who sort of have

that habit, I've noticed are tossing and

turning at night.

Yes.

And then they go on their phone and then

they wake up tired and they can't wait

to go to sleep in the afternoon after

lunch.

A lot of students know uh if they don't

get their sleep at night, they're so

used to scrolling on reals and being on

social media. So that you know disrupts

your entire sleep cycle and these

students you know see when you when

you're seeing your screen time your your

screen your your res it it plays on into

your subconscious mind when you're going

up to sleep and uh it is not a good deep

sound sleep.

Social media is something that is very

relevant uh in our day and age.

Correct.

I believe that social media um can be

very useful.

Yes.

Like just what we're doing right now. uh

we're using that very platform to spread

awareness.

Uh but I also think that too much of

anything is not good and especially

timings is what I feel is very

important. Do you think it's beneficial

for education or do you think it's

acting as a barrier for their learning

and their timings in teenagers?

This is a very debatable question and

everybody may have a very different

viewpoint. Well, what I personally feel

is social media is important because

today we are in an era where we connect

with people through social platforms. So

that's very important. Uh as you

mentioned earlier, anything of an

overdose is harmful. So one, you have to

limit your social media usage during the

day. Two, avoid using social media when

you're about to hit the bed. Avoid using

social media when you have your peak

working prime time. you know when your

mind is more receptive. So if you follow

on these rules, you follow a certain

discipline in using social media, it can

work in your favor. Social media can

also be used as a learning tool.

Yeah.

As you mentioned, you know, seeing such

podcasts also a lot of uh a lot of uh

study data is available on social media

which is very beneficial to students. So

it can be used in your favor.

We definitely have a generation gap

between us. I want to know from a

teacher's point of view in your 35 years

of experience how it was 35 years ago

and now and how children perceive social

media and why do you think that it's now

that we're so hooked on to it to a point

where it's affecting their sleeping

schedules.

Uh see anything that that is new that

comes no

there's a lot of crave for that in the

market.

Yeah. uh and this crave would last for

for a period. That period could be a

decade or two or more. Um I don't feel

that there is a gap between the Gen Z's

and the Gen X. In fact, there is a

bridge. Okay. Now, this bridge has to be

used very effectively. Um what happened

was we were the ones who were slowly

this social media just came into picture

at our times and you all were born in

that era. uh what what was what should

have been done was you know in the

beginning itself if there was

disciplining of social media at that

time okay effective use today we would

have been able to use social media and

all these open other platforms in favor

of your generation that discipline was

lacking in the beginning now because it

was lacking no it has been you it has

been misused for a lot of resistance I

mean some of the people in our

generation through I mean Anything new

is always resisted. So I feel you know

we offer a lot of resistance to the use

of social media and not everybody got

very compatible and very comfortable

with it. But since your generation was

born into it, parents also found it very

easy to to discipline kids using iPads,

mobiles and those kind of things because

see colors uh everything in social media

know the way it presents know it's very

glamorous. It's very impressive and it's

it's very appealing. So it it lurs you

more and more to it and kids like

colors, they like vibrance and stuff

like that. So I feel if there was a

little discipline there okay it would

have been really better but well it

didn't. So now onwards if the next

generation of parents which are coming

up the next the gen alpha beta what will

come up? No I think parents are already

aware that there has to be some kind of

discipline. So if they inculcate strong

disciplined rules in terms of usage of

this and how it can work in your favor,

I think the next generation will not be

facing so much of a problem in terms of

uh misuse of social media is what I

feel.

That that's definitely true sir. And uh

just the other day I was visiting this

uh beautiful nonprofit organization

called Sur. I think they're doing

brilliant work and what one of the

psychologists over there said that

children don't have access to phones in

some they do have is a computer lab.

Okay.

So in the computer lab um children have

safe browsing

opportunities where someone's present

there and they're overlooking what

children are accessing. And what was

found is that later on when these

children pass out they've become adults

and they're going on to a phase in the

life where they're giving competitive

exams. Okay.

Um they sort of asked questions like,

"Oh, how are you able to afford

coaching?" And they say, "No, ma'am. Uh

you've taught us how to do this all

these years on YouTube." So if children

are actually encouraged to use social

media the right way,

correct?

It's so beneficial because they're

saving thousands on coaching costs.

Everything is accessible on YouTube. But

you need to use YouTube for the right

things.

Correct. Correct. So that's what I

and that can be brought only by parents

and teachers and responsible uh people

in your in country.

Yeah. I wanted to ask you one more thing

sir. Um a lot of children when you

mentioned anxiety, stress and depression

um apart from parents um who they spend

all day with

another set of people that they spend

almost 8 hours a day is with their

teachers from 8:30 in the morning to

3:30 in the evening they're with their

teachers and sometimes even later for

after school tuition.

Yes. So it's a huge responsibility in

terms of how they perceive life,

what they say is mentorship is perceived

by how they look at their teachers.

Correct.

How do you feel as a teacher, you are

emotionally available to students in a

way that's not just academic in order to

inspire them

in building good routines.

Okay.

And managing stress

and also highlighting the fact that it's

okay to feel stressed. It's okay to feel

anxious without necessarily disregarding

how they're feeling.

Wow. So, um I handle mathematics. Uh

that's my core subject and students

normally fear the subject a lot. Uh so

what I do is know one I make them like

me as a person first. So once they like

me I transfer their liking to the

subject mathematics. So they start

liking the subject mathematics. one two

they generally tell me they're very

worried scared and fearful about mads I

always feel that this fear is good fear

because only when you're fear fearful

you're little worried about something no

that keeps you going if you have an

attitude oh I'm not worried about it

then you won't put your efforts at all

in it okay two students as a growing

they go through a lot of emotional uh

issues and things like that because if

parents are working they may not be

available all the time. Two, uh parents

know are unable to be friends with their

kids, they are they are more uh the

nagging the lecturing type and that's

what uh children don't like. So uh when

when they come under a teacher and if

they find a teacher who is able to

accept them the way they are, who able

to listen to their problems, okay, then

that's where mentoring starts. uh so I

perceive experience that uh when when

they start liking me and they start

liking my subject they start opening up

they tell us about the fears and I and

I'm sure most teachers around the world

okay since they're teachers they do give

that extra support system in in talking

to the students and understanding their

problems and guiding them you know

motivating them it's just that I mean if

you didn't get a right guide or right

teacher you've been unfortunate okay I

don't think teachers are bad the

situation may not be right at that

moment but by and large all teachers do

mentor and uh I enjoy mentoring my my

kids I enjoy connecting with them I

enjoy listen to their stories I feel

very happy you know to know the way they

start doing well and as somebody who

found something very challenging and has

started being good in that oh my god it

It really motivates me to do much much

much much better for the others you

know. Uh students have always kept me

young. I mean it has they've never let

me grow older. Uh sometimes people ask

me you know

you're so young. You know it's a 34 35

years of experience. People say are you

that old? So I say uh you know well

people will say love effect and I'll say

it's a students effect. It's my students

who keep me always young and very

energetic. All true. That's so beautiful

that you think that way. So, because it

takes a lot of passion to contribute so

much to us this field and feel so deeply

about students wanting to grow and um I

wanted to touch upon one last thing.

Uh what does it mean to be a memory

coach? You said you were a memory coach.

Yes. The Indian education system is

mostly based on memorization. Correct.

uh it has a lot of emphasis on recalling

concepts correct and being able to write

a lot of heavy matters in a span of a

few hours. That's how our examination

works. Correct.

So memory is something that's extremely

important to Indian students. So what

does it mean to be a memory coach?

Yes. So I have been uh associated with

this organization called as growth

vidyapit. The founder member is Mr.

Ratesh Sa and other coaches are Mr. Bhan

Danesha, Urui Danesha, Kim ma'am and

those people. Uh now here this memory

technique is basically based on

association

right

uh we trained students how to remember

uh 20 words 40 words in a span of 90

minutes in the span of uh 180 minutes.

Okay. you you give us words and we'll be

able to recall back in just about 90

minutes and give you back either in the

same order reverse order or any order.

Uh with this technique we can also

memorize um you know 100 digits 50

digits okay in a span of about uh again

120 minutes or less or more depending

how strong coach you are. Now by by

learning these techniques okay you are

able to apply this in memorizing your

long answers, short answers, periodic

table, entire periodic table then even

your math formula then physics concepts

you know uh even memorizing big passages

you know some now definitions have to go

just the way they have they are in the

textbook. So it helps you to you know

improve on those areas and you're able

to reproduce them exactly the way it is

given in the book and uh since as you

mentioned all our exams in India are

memory based u that's where you know

this technique you know sharpens your

mind your skills and helps you to

perform optimally in an exam.

So it's a technique it's a science. So

once you learn this technique, you apply

it to your uh to your routine of

studies, it definitely 110%

brings improvement in your academic

output. Scholastic performance

that that definitely seems like a very

powerful tool.

110%. I strongly recommend that students

must take up memory coaching to enhance

a performance on exam. Yeah, I think

it's um powerful what you said about

memory, but um I don't think any of this

is possible without sleep and a good

night's sleep is definitely essential

for memory and recall.

Yes,

no matter how many coaching centers you

go to, no matter how many hours you

spend studying, if you don't have a good

night's sleep, you almost will find it

impossible to learn all that. Su

I 100% agree with this. Nandini,

thank you so much for your time today,

sir. I'm so grateful that you took your

time here to be with us and talk to us

about your experience. Uh I think

teachers like you is what creates future

generations of confident kids.

Thank you so much.

Thank you so much sir.

I really enjoyed being here Nandini. It

was fantastic. A wonderful experience.

I I felt really glad that I shared most

of my experience and inputs about how to

develop a student you know to perform

better on this platform. And thanks for

giving this opportunity to me. Yeah.

Bye. Thanks. Good luck guys. Take care.

Thanks for listening.

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