I've heard from many people, and read many online articles explaining how we sleep in 90 minutes "cycles" and it's better to plan your night of sleep around that idea. For example, it's better to sleep 6, 7.5 or 9 hours because you will wake up in between the cycles. How much truth is there to this?
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I've heard from many people, and read many online articles explaining how we sleep in 90 minutes "cycles" and it's better to plan your night of sleep around that idea. For example, it's better to sleep 6, 7.5 or 9 hours because you will wake up in between the cycles. How much truth is there to this?
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