Every person goes through ...stages of sleep.
The last stage of sleep is called
In the stage REM you
Very bad dreams are called
You dream....times during the REM stage.
If you have problems falling asleep, you shouldn't drink .... in the evening.
Many teenagers can not get out of bed in time for school because...
Sleep is ....important for teenagers.
Melatonin is
Research has shown that teeenagers start to produce melatonin at
If tennagers do not get enough sleep, they can
... some schools start their classes later in the morning.
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до активної роботи у класі та вдома