Why do newborns smile when they sleep?
The right time for smiles
When sleeping, a newborn normally goes through 2 sleep phases: active sleep and deep sleep. The active phase, also known as REM which is an acronym for Rapid Eye Movement, is thought to be produced by intense brain activity. This occurs approximately 60-90 minutes after falling asleep, but sleep works in cycles, so REM will alternate with deep sleep as well. Nevertheless, it’s precisely during REM sleep that we will most likely see our babies smile, grimace, or stretch their legs, as involuntary acts of their body.
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