These are completely normal and reasonable physiological characteristics of this age: during
the shallow sleep the brain is actively developing, information obtained during his waking time is being processed and analyzed; the body is storing energy and strength for the next day.
Every time their
brain signals settled into the slow - wave pattern characteristic of deep, dreamless
sleep, the researchers sent a series of beeps through the headphones, gradually getting louder, until the participants» slow - wave patterns dissipated and they entered
shallower sleep.