Seven to nine hours should be the ideal amount of time. But more importantly, the quality of sleep is what should be addressed. If anyone is tired during the day after a night of sleep, a sleep study should be considered. On of my areas of expertise is in treating people with sleep related breathing disorders (SRBD), who don't want to use a CPAP.
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2018 F80 M3. YMB/BLK. ZCP. Three Pedals.
"Education will never be as expensive as ignorance."
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