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The amount of sleep also depends on age, obviously.

Well, kids need more, obviously.

But old people do not really less than young adults, according to "Why we sleep".

>Well, kids need more, obviously.

Not really obvious. Babies and toddlers maybe, but kids after 5-6 seem to have much more energy.

On age and your activities during the day. Insomnia and lack of sleep are really bad.