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lambs_ear1 karma

hello doctor and thank you for this AMA!

i'm curious about the length of sleep and why it can have differing results in people, such as, when a person gets relatively little sleep (say 4-6hrs) and feel okay, but that same person getting too much sleep (say 10-12hrs) can make them feel awful. does length of sleep have more of an affect on a person than the actual quality of it? at what point does quality and length even out? and lastly, does this length of sleep needed to feel rested differ from person to person or do we all collectively need exactly 8hrs as many are told from youth?