A strange thing happens to nearly e

A strange thing happens to nearly everybody at night.They turn off the lights，pull up the covers and close their eyes.Six or seven sleeping hours later，they wake up again.Strange，isn't it？<br>Sleep puzzles(使--困惑) science.Scientists and doctors would rather talk about why one can't fall asleep.They are not sure what causes sleep.The best conditions for sleep are good health and meals neither too big nor too small.No worries and a comfortable place are important，too.They advise against two in one bed.<br>Strange things happen during sleep.For example，you move often.You would feel tired if you didn't.You also dream.Part of your brain is still awake when you dream.Dreaming happens when the memory and imagination parts of your brain are still awake.Experiments have shown most of us dream in colour.Bad dreams may be caused by stomachache.<br>Don't worry if you dream.Some great stories and pomes were finished wnile their writers were dreaming

A strange thing happens to nearly everybody at night. They turn off the lights，pull up the covers and close their eyes. Six or seven sleeping hours later，they wake up again. Strange，isn't it？<br>Sleep puzzles(使--困惑) science. Scientists and doctors would rather talk about why one can't fall asleep. They are not sure what causes sleep. The best conditions for sleep are good health and meals neither too big nor too small. No worries and a comfortable place are important，too. They advise against two in one bed.<br>Strange things happen during sleep. For example，you move often. You would feel tired if you didn't. You also dream. Part of your brain is still awake when you dream. Dreaming happens when the memory and imagination parts of your brain are still awake. Experiments have shown most of us dream in colour. Bad dreams may be caused by stomachache.<br>Don't worry if you dream. Some great stories and pomes were finished wnile their writers were dreaming

几乎每个人晚上都会发生一件奇怪的事情。他们关上灯，掀开被子，闭上眼睛。六七个小时后，他们又醒了。奇怪，不是吗<br>睡眠难题（Sleep puzzles）科学。科学家和医生宁愿谈论一个人为什么睡不着觉。他们不确定是什么导致睡眠。最好的睡眠条件是身体健康，饭菜不太大也不太小。没有烦恼和舒适的地方也很重要。他们建议不要一床两人。<br>奇怪的事情在睡眠中发生。例如，你经常移动。如果你不这样做，你会感到疲倦。你也做梦。当你做梦的时候，你的一部分大脑仍然清醒。当你的记忆和想象部分仍然清醒的时候，做梦就会发生。实验表明，我们大多数人做梦都是彩色的。恶梦可能是由胃痛引起的。<br>如果你做梦，别担心。一些伟大的故事和柚子是在他们的作家做梦的时候完成的<br>