Although data of Apple users might not reflect the general population, the 'fact that we don't get enough sleep [is] clear across the board,' says Karin Johnson, a sleep medicine specialist and professor of neurology.
'Sleep is foundational to health.... It doesn't matter if you work out all the time [and eat well]. If you don't sleep, you're not going to get the gains you want. You're not going to feel well,' says Seema Khosla, the medical director of the North Dakota Center for Sleep.
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