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The most common view of sleeping is of a daily activity that allows us to rest for about four to eight hours in a day. In scientific terms, sleep is defined as the primary anabolic process that is characterized with absolute minimum amount of consciousness. This is also the time when a person is impassive to his surroundings. And this is when a person dreams.
Sleep and dreams have a great relation between them. It is not like we cannot dream while we are awake, but what most of us experience are the dreams once we go to sleep. Dream Sleep is one of the important stages in the sleep cycle of a human being. During this stage, about 70 to 90 minutes into your sleep cycle, you enter REM or the rapid eye movement sleep. During this stage your eyes twitch rapidly in various directions under your eyelids, thus the name Rapid Eye Movement (REM) Sleep.
We have 3 to 5 stages of REM sleep per night. They usually come at intervals of 1-2 hours and are quite variable in length. An episode of REM sleep may be brief and last but 5 minutes. Or it may be much longer and go for over an hour.
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