If you want to wake up early (or at any specified time), try t | Shocking Facts®

If you want to wake up early (or at any specified time), try to fall asleep along an interval of 90 minutes.

3/4.5/6/7.5/9 hours - this is how long each REM cycle is. Waking between cycles leaves you refreshed, while waking in the middle will leave you groggy.

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