> A new study suggests it may be sleep, and in particular deep sleep. That’s the stage when the body repairs bones, muscles and the immune system. It’s also whe

> A new study suggests it may be sleep, and in particular deep sleep. That’s the stage when the body repairs bones, muscles and the immune system. It’s also when the brain consolidates new memories. If you burn the candle at night, you’ll be more susceptible to illness and more likely to forget things you recently learned. Wait, I thought it was REM sleep that was responsible for memory consolidation and learning? Can someone clarify?