Human Growth and Development / Unit 3 HGD 0308 short lesson, about 20 seconds
Night and Day
Captions available
The idea
Newborns do not separate night from day; daytime sleep falls by about three months, and by twelve months most sleep comes at night.
In practice
Night waking dropping around six months, though some waking continues into the second year.
Where people slip
Fragmented sleep is treated as a problem mainly in cultures where night waking and shared beds are less typical.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
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