How many hours do you need to sleep?, 6, 7, 8, 11, 9, 10, How many % of teenagers are sleep deprived?, less than 20%, 50%, 60-70%, about 100%, 80-90%, How called the state when can t fall asleep or stay awake for too long?, sleeplessness, insomnia, unsleep, Will you die if you don t sleep?, yes, no, may be, What do we dream for?, for nothing, to remember, to solve problems, to relax, to forget, to get rid of useless information, Do dreams have reason to occure?, always, sometimes, never, it depends.

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