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Q: What happens to the brain during orthodox (Non-REM) sleep?
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Orthodox (Non-REM) Sleep
During orthodox sleep, the brain is apparently resting. Its blood supply is reduced and its temperature falls slightly. Breathing and heart rate are regular. The muscles, however, remain slightly tensed. Orthodox sleep is broken up by about five (5) periods of paradoxical sleep which are of progressively longer duration throughout the course of the night.
