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9 Ways to Wake Up Earlier

Tania Khadder | WomenCo.

August 10, 2009

2) Know the 90-minute rule.

We’ve all heard that eight hours sleep is the ideal, but this theory goes against sleep research that says human sleep cycles occur in 90-minute intervals.

This hour-and-a-half is said to include two doses of REM sleep, separated by one of non-REM. Therefore, the best way to get the most of your sleep time is to make it a multiple of 90 minutes. And it makes sense. I’ve noticed that when I sleep a full eight hours, I wake up feeling groggier than I do when I sleep for six, even though I’m missing out on two whole hours of shut-eye.

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