Until quite recently, scientists believed that sleep was a simple resting state.0:33
But it isn't like this at all.0:39
When we sleep, our body temperature drops, our heart rate and other bodily functions slow down, but our brains stay very active.0:42
What are the different stages?0:54
There are four different stages of sleep.0:57
That repeat every 90 to 110 minutes.1:00
Stages N1 and N2 are light sleep, and we can easily wake up.1:04
In stage N3, we sleep more deeply, and it's harder to wake up.1:10
Some people may also sleepwalk or talk in their sleep.1:16
The last stage is REM sleep.1:21
Our eyes move around, our brain is very active, and we have a lot of dreams.1:24
Why do we need sleep?1:31
While we sleep, our brain sorts through information, replaces chemicals, repairs cells, and solves problems.1:34
Lack of sleep seriously affects our mind and body.1:43
When we don't rest enough, we may feel grumpy, forgetful, and unable to concentrate.1:47
Lack of sleep can also affect our immune system.1:56
Over a long time, it may cause depression and personality changes, and eventually even shorten our life.1:59
How much sleep do we need?2:08
It's different for everyone, but on average, babies need 16 to 18 hours of sleep, teenagers about 9, and adults about 7 to 8.2:10
Tips for getting a good night's sleep.2:22
You should try to go to sleep and wake up at the same time every day.2:26
This helps your body to get into a routine.2:31
Avoid drinks like cola and coffee before bedtime.2:35
They contain caffeine that keeps you awake.2:39
Don't exercise or watch scary movies just before going to bed.2:43
This will wake your body up too much, and you might find it difficult to fall asleep.2:48
Have a calming bedtime routine, such as having a warm bath or reading.2:54
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