We Are Bombarded by Information Throughout the Day, Which Causes

We are bombarded by information throughout the day, which causes our neural networks to become more and more active. As a result, our brain requires more and more energy to continue functioning; and

A) slow-wave NREM sleep early in the night brings overall brain activation down, allowing a fresh approach to the next day.
B) fast alpha-wave REM sleep early in the night increases overall brain activation, providing the needed energy.
C) the brain literally "shuts down," allowing the brain to overcome its fatigue and start fresh the next day.
D) the brain enters hypnopompic sleep, which brings the overall brain activation down, allowing the brain to recover from any fatigue and stress.