Alcohol How Alcohol Wrecks Your Sleep Architecture (And What You Can Do) The nightcap feels like it helps sleep. The tracker data is unequivocal: even moderate alcohol fragments REM and cuts deep sleep by 20-30%.
deep sleep Deep Sleep vs REM: Which One Actually Repairs Your Body Total sleep hours are only part of the story. Deep sleep and REM do different jobs — losing one is different from losing the other.
