Why do we sleep?
Most people spend about one-third of their lives sleeping.
If someone lives to around 75 years old, they may spend about 25 years asleep.
Scientists know that sleep is very important.
However, they are still learning exactly why we need it.
What is sleep?
Sleep is a natural state where:
Your body rests.
Your brain works differently.
You become less aware of the world around you.
Your muscles relax.
Your body repairs itself.
Even though you are asleep, your brain is still very active.
Your Brain During Sleep
Several parts of your brain work together while you sleep.
These include:
🧠 Hypothalamus
Controls your body clock.
Helps you know when to sleep and wake up.
🧠 Suprachiasmatic Nucleus (SCN)
The body's main clock.
Uses light from your eyes to tell day from night.
🧠 Thalamus
Helps process information from your senses.
Plays an important role during sleep.
🧠 Pons
Helps control REM sleep (dream sleep).
Hormones That Help Sleep
Your body releases several hormones while you sleep.
Melatonin
Melatonin is called the sleep hormone.
It:
Makes you feel sleepy.
Increases when it gets dark.
Decreases when it becomes light.
Growth Hormone
Growth hormone helps:
Children grow.
Repair muscles.
Heal the body.
Keep tissues healthy.
Much of this hormone is released while we sleep.
Why Do Scientists Think We Sleep?
Scientists have several ideas.
1. To Help the Body Recover
Sleep gives your body time to:
Rest.
Repair itself.
Save energy.
Heal after illness or exercise.
2. To Help the Brain Learn
Sleep helps your brain:
Store memories.
Learn new information.
Solve problems.
Improve concentration.
Make decisions.
This is one reason students are encouraged to get enough sleep before an exam.
3. To Help Us Stay Healthy
Getting enough sleep can help:
Improve mood.
Reduce stress.
Strengthen the immune system.
Improve coordination.
Keep the brain working well.
What Happens If You Do Not Get Enough Sleep?
Not getting enough sleep can make it harder to:
Concentrate.
Remember things.
Learn new skills.
Make good decisions.
Control emotions.
You may also become:
Tired.
Irritable.
Less alert.
More likely to make mistakes.
Everyone Sleeps Differently
Everyone is different.
Some people:
Fall asleep quickly.
Sleep all night.
Wake up feeling refreshed.
Others may:
Take a long time to fall asleep.
Wake up several times.
Need more sleep than other people.
Have sleep difficulties because of medical or neurodevelopmental conditions.
Examples include:
Autism.
ADHD.
Anxiety.
Depression.
Chronic pain.
These conditions can make getting a good night's sleep more difficult.
Did You Know?
Scientists can study sleep by recording brain activity using a machine called an EEG (electroencephalogram).
This allows them to see the different stages of sleep.
Key Words
Sleep – A natural state of rest for the body and brain.
Melatonin – A hormone that helps you feel sleepy.
Growth hormone – A hormone that helps the body grow and repair itself.
SCN – The body's main clock in the brain.
REM sleep – The stage of sleep when most vivid dreaming happens.
EEG – A test that records the brain's electrical activity.
Remember
Sleep is essential for both the brain and the body.
It helps us:
Learn.
Remember.
Grow.
Repair our bodies.
Stay healthy.
Feel our best.
Scientists are still learning exactly why we sleep, but they know it is one of the most important things we do every day.
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