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I’ve long advocated that 7.5 or 9 hours is the perfect number of hours to sleep, give or take a few minutes depending on your REM cycles. Plus, this formula doesn’t account for the time it takes to fall asleep.
I discussed sleep in How To Increase Natural Testosterone.
If you are living on 4.5 or 6 hours of sleep, see the chart below.
Sleep or Die
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