Additionally, school feeding programs are increasingly being viewed as a potential safety net and as a social support measure that helps keep children in school.
The first REM sleep period usually occurs about 70 to 90 minutes after we fall asleep. A complete sleep cycle takes 90 to 110 minutes on average. The first sleep cycles each night contain relatively short REM periods and long periods of deep sleep.
The right and left hemispheres of the brain are more coherent in REM sleep, especially during lucid dreams. REM sleep is punctuated and immediately preceded by PGO (ponto-geniculo-occipital waves) waves, bursts of electrical activity originating in the brain stem. These waves occur in clusters about every 6 seconds for 1â2 minutes during the transition from deep to paradoxical sleep. They exhibit their highest amplitude upon moving into the visual cortex and are a cause of the rapid eye movements in paradoxical sleep.