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DREAMING EXPLAINED
Each night, we spend about one and a half to two
hours dreaming. We dream about once every 90
minutes of sleep. The time you spend in dreams
becomes longer throughout the night, from about
10 minutes to around 45 minutes or slightly
longer. But what happens when we sleep?
The stages of sleep
There are five stages of sleep: four stages of
NREM (Non-REM) sleep, also called SWS (Slow-Wave
Sleep), and one stage of REM (Rapid Eye
Movement) sleep. The most vivid dreams, and
therefore the ones we remember the most, occur
during REM sleep (though we dream in other
stages too). One sleep cycle is roughly 90
minutes long.
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