ОБРАЗОВАНИЕ НАУКА И ИННОВАЦИОННЫЕ ИДЕИ В МИРЕ
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THE IMPACT OF SLEEP ON COGNITIVE BRAIN FUNCTIONS
Karimova Khusniya Sherzodbek qizi¹,
Aysacheva Maftunabonu Oybekovna²
¹2nd-year student, Andijan branch of
Kokand University, 170119,
Andijan, Uzbekistan
²Department of Microbiology, Pharmacology,
Normal and Pathological Physiology,
Andijan branch of Kokand University,
170619, Andijan, Uzbekistan
Abstract
Sleep is not a passive state but an active physiological process that plays a decisive
role in maintaining cognitive health. This article examines sleep phases,
neurophysiological mechanisms, and the influence of sleep on attention, memory,
learning, and decision-making. Special attention is given to the consequences of
chronic sleep deprivation and sleep disorders. Neuroscientific data are presented,
emphasizing the need for quality sleep to ensure effective mental performance.
Keywords: sleep, cognitive functions, memory, attention, brain, sleep stages, sleep
deprivation, neuroplasticity.
Introduction: Modern society lives in a state of constant rush and information
overload. In many cultures, sleep is viewed as a luxury rather than a necessity.
However, neuroscience has long proven that sleep is a key component of brain health
and cognitive processes. Sleep disorders are directly linked to reduced concentration,
ОБРАЗОВАНИЕ НАУКА И ИННОВАЦИОННЫЕ ИДЕИ В МИРЕ
https://scientific-jl.org/obr
Выпуск журнала №-71
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memory deterioration, decreased learning ability, and even an increased risk of
neurodegenerative diseases. This article explores how sleep affects the brain's
cognitive functions.
Neurophysiology of Sleep
Sleep
is
divided
into
two
main
phases:
REM sleep (Rapid Eye Movement) - characterized by brain activity similar to
wakefulness. This is the phase in which dreams occur, emotional processing takes
place,
and
memory
consolidation
happens.
NREM sleep (Non-Rapid Eye Movement) - includes stages from light to deep sleep.
During this phase, the div recovers, toxins are cleared from the brain, and neural
connections are strengthened. A full sleep cycle
lasts about 90 minutes and is repeated 4–6 times per night. Each sleep phase performs
a unique function in maintaining cognitive balance.
Sleep and Memory
Sleep
plays
a
critical
role
in:
Memory consolidation - transferring information from short-term to long-term memory
(hippocampus
→
neocortex).
Emotional filtering - the brain “sorts” emotionally significant information during sleep.
Knowledge retrieval - sleep promotes restructuring of knowledge and enhancement of
associative connections. Sleep deprivation
disrupts this process: a person may learn something but cannot retain or recall it over
time. This is a common problem for students, although they may struggle to manage
it. Insomnia is a condition that reduces quality
of life and work capacity. It can lead to a range of diseases, including arthritis. Patients
with sleep disorders often report problems with concentration and memory.
ОБРАЗОВАНИЕ НАУКА И ИННОВАЦИОННЫЕ ИДЕИ В МИРЕ
https://scientific-jl.org/obr
Выпуск журнала №-71
Часть–6_ июня–2025
386
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Effects of Sleep on Attention and Concentration
Even
slight
sleep
reduction
leads
to:
slower
reaction
times,
distractibility,
impaired
decision-making,
errors in tasks requiring precision and focus.
Chronic sleep deprivation reduces activity in the prefrontal cortex - the brain area
responsible for logical thinking, planning, and self-control. Chronic insomnia, lasting
more than three months, affects 15 to 30 percent of the global population, according to
various sources. The causes of sleep disorders are numerous. Among the diseases that
provoke these disorders are Parkinsonism, hyperthyroidism, depressive disorders,
neuroses, kidney disease, and arthritis.
Creativity and Problem-Solving
REM sleep plays an important role in insights and creative thinking. Studies show
that after sleep, people perform better on tasks requiring out-of-the-box thinking. Sleep
helps integrate scattered data, allowing for unexpected solutions.
Consequences of Chronic Sleep Deprivation
Reduced neuroplasticity - impaired ability of the brain to adapt and learn.
Accumulation of beta-amyloid - a protein associated with Alzheimer’s disease.
Increased cortisol levels - a stress hormone that suppresses hippocampal function.
Higher risk of depression, anxiety, obesity, diabetes, and stroke. Even
one night of sleeplessness can impair cognitive functions to a degree comparable to
alcohol intoxication.
Sleep in Adolescents and Students
Lack of sleep is particularly dangerous for the developing brain. Studies show that
schoolchildren and students who sleep less than 7 hours a night:
score
lower
on
tests,
ОБРАЗОВАНИЕ НАУКА И ИННОВАЦИОННЫЕ ИДЕИ В МИРЕ
https://scientific-jl.org/obr
Выпуск журнала №-71
Часть–6_ июня–2025
387
2181-
3187
experience
more
emotional
breakdowns,
show lower motivation and creativity. It
is important to consider biological rhythms: adolescents have a shifted biological "time
zone," so early school start times contradict their physiology.
Ways to Restore Healthy Sleep
Sleep hygiene - avoid gadgets 1-2 hours before bed, sleep in a dark and cool room,
maintain
a
regular
schedule.
Physical activity - improves sleep quality if done no later than 4 hours before bedtime.
Meditation and breathing techniques - help reduce anxiety and prepare for sleep.
Limit caffeine and heavy meals in the evening.
Conclusion
Sleep is not merely “disconnection” from the external world, but an active and
vital process during which key cognitive transformations occur. The quality and
duration of sleep affect productivity, learning ability, and overall mental health.
Ignoring sleep is a direct path to reduced efficiency and increased risk of disease. Good
and regular sleep impacts not only our health but also our daily mood and energy.
Everyone should establish their own sleep routine and ensure quality rest, as it is a
fundamental human need. Therefore, treating sleep with care is an investment in our
intellectual and physical future.
References
1.
Walker M. Why We Sleep. Unlocking the Power of Sleep and Dreams. —
Penguin Books, 2017.
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Rasch B., Born J. About sleep’s role in memory.
Physiol Rev
, 2013.
https://doi.org/10.1152/physrev.00032.2012
3.
Killgore W. Effects of sleep deprivation on cognition.
Progress in Brain
Research
, 2010.
ОБРАЗОВАНИЕ НАУКА И ИННОВАЦИОННЫЕ ИДЕИ В МИРЕ
https://scientific-jl.org/obr
Выпуск журнала №-71
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4.
Xie L. et al. Sleep drives metabolite clearance from the adult brain.
Science
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2013. https://doi.org/10.1126/science.1241224
5.
Beattie L. et al. Sleep and academic performance in university students.
Journal of American College Health
, 2015.
6.
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