If you're getting the recommended 8 hours of sleep, does it matter when you get it?
"The time of night when you sleep makes a significant difference in terms of the structure and quality of your sleep," said Dr. Matt Walker, head of the Sleep and Neuroimaging Lab at the University of California, Berkeley.
The ratio of REM to non-REM sleep changes through the night, with non-REM sleep dominating cycles earlier in the night and REM sleep kicking in closer to sunrise, Walker said. That means a late night could result in insufficient amounts of deep, non-REM sleep. As we discussed earlier, it's crucially important to get healthy amounts of both REM and non-REM sleep.
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