The role of sleep suddenly changes in toddlerhood, study shows

Mathermatical modelling using data from 60 sleep studies elucidates the transition.

Scientists have identified an abrupt transition in the role of sleep in the brain at about 2.4 years old when its primary purpose appears to shift from brain building to maintenance and repair.

little boy aged 2-3 years asleep

US researchers conducted an analysis using data from more than 60 sleep studies.

The Californian researchers looked at sleep time, duration of rapid eye movement (REM) sleep, brain size and body size, and devised a mathematical model for how sleep changes during development.

During REM

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