It happens most intensively between the ages of 12 and 16½: After years of frenzied fluctuation, the brain's electrical output during the deepest phase of sleep -- the delta, or slow-wave phase, when a child's brain is undergoing its most restorative rest -- becomes practically steady.
That appears to coincide with what neuroscientists have described as major architectural changes in the brain that pave the way for cognitive maturity.
While babies, toddlers and young children are taking in and making sense of the world, their brain cells are wiring themselves together willy-nilly, creating super-dense networks of interwoven neurons.
But as we reach and progress through adolescence, neuroscientists have observed, a period of intensive "synaptic pruning" occurs in which those networks are thinned and the strongest and most evolutionarily useful remain.
In a study published recently, scientists from the University of California-Davis say they believe the slowed fluctuations observed during the delta phase of teens' sleep may be evidence of that pruning process at work.
And since mental illnesses appear to take root during adolescence, the study authors say the changing architecture of sleep may offer clues on how that process of neuronal pruning goes awry and mental illness sets in.
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