You have approximately 4 to 6 dreams per night during a stage in sleep called REM (Rapid Eye movement). REM stages and the length of dreams early during sleep can last from 5 to 10 minutes. Stages later during the night can last for half an hour or more.
To try to remember some of your dreams, set a timer to wake you up every 90 minutes. Waking up every 90 minutes will give you a better chance at remembering dreams that would otherwise go forgotten.
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