A recent study of more than 40,000 people worldwide confirms the sweet spot for sleep: People who got average of seven to eight hours a night did better than those who got more or less sleep a night.
from WebMD Health https://ift.tt/2Eebjlr
A recent study of more than 40,000 people worldwide confirms the sweet spot for sleep: People who got average of seven to eight hours a night did better than those who got more or less sleep a night.
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