There are five distinct stages of sleep which humans pass through each time they go to sleep for the night. However, only one stage of sleep, REM sleep,standing for rapid eye movement, is the stage where dreams occurs. The other four stages are called non rem sleep stages.
The following is a simplistic explanation of the 5 stages of the sleep cycle
Stage 1
Stage 1 sleep normally lasts for about 5 to 10 minutes. You are not meant to stay in this stage for very long because this stage is simply meant as a stage to help your body and muscles relax. It is basically a transition stage to deep... From: Five Stages of The Sleep Cycle: Everyone Must Dream
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