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Light or heavy sleeper

ARE YOU A LIGHT OR HEAVY SLEEPER?

Slightest noise can wake you at night. While for others, even the wailing siren of a passing fire truck can't disturb their sleep.Why? Are you a Light or Heavy sleeper? Sleep  Cycle Sleep is an alternate cycle of REM (rapid eye movement) and NREM (non-rapid eye movement) that repeat about every 90 minutes.

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