A strange thing happens to nearly everybody at night. They1 the lights, pull up the covers and close their eyes. After they sleep for six or seven2, they wake up again. It sounds very strange, doesn't it? Sleep puzzles scientists all the time. 3 and doctors would like to talk about why one can't fall asleep. They are not so sure4 causes sleep. You will sleep the best both5 you are in good health and when you don't eat too much or too little. No worries and a comfortable place to sleep are6, too. They advise against two in one bed. Strange things7 during sleep. For example, you often move during your sleep. You should feel8if you didn't move. You also9. Part of your brain is still10 when you dream. Don't worry if you dream. Some great stories and poems were finished while their writers were dreaming.
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