The deepest stage of sleep (Stage 4, which usually occurs about four hours after you go to bed) boosts brainpower most, say
researchers at the Center for Molecular and Behavioral Neuroscience at Rutgers University in New Jersey. That’s when your
brain consolidates memory and transfers learned information from the hippocampus to the neocortex, where long-term memories
Think about setting a regular bedtime that allows for seven or eight hours of sleep per night. Since you can’t predict when you’ll fall into Stage 4 sleep, it’s best to get a good night’s rest overall.