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We have four or five REM stages of sleep during the night. The first occurring about 90 minutes after we fall asleep. After that, our dreaming periods recur every 90 minutes and last between 15 to 45 minutes, getting longer as the night progresses. The main purpose of sleeping (apart from giving us rest) may be to allow us to dream - to review our lives, our worries and hopes in a totally different way, and to get an unconscious view of ourselves, getting rid of material from our memories that we no longer need. Some dreams may have a simple physiological cause. Dreaming of walking on hot coals, for example, may well be caused by sleeping with your feet too close to a heater. And the frustrating dream in which you try to run but your legs won't move may be explained by bedding that is too tight. Anyone who sleeps through their alarm may well dream of doorbells or telephones ringing. All are simple examples of how the unconscious works with our conscious mind to guide and advise us.
每晚我们有四、五个REM睡眠阶段，第一次出现在入睡后的90分钟左右。此后，梦期每90分钟复现一次，每次持续15到45分钟，持续时间随着夜晚的深入逐渐增长。 睡眠的主要目的（除让我们休息外）也许就是让我们做梦——让我们以一种截然不同的方式回顾我们的生活、我们的忧虑和希望，以及在潜意识中观察自我，把不再需要的资料从记忆中剔除。 有些梦可能是由简单的生理原因引起的。例如，梦到在灼热的煤块上行走很可能是因为睡眠时脚太靠近取暖器。而梦到想跑但两腿却动弹不了这种令人沮丧的境况，也许是被子裹得太紧的缘故。闹铃响了而依然熟睡的人则很可能会梦到门铃或电话铃响。所有这些都是潜意识和意识共同引导和启示我们的简单例子。