Which matters more for lifting recovery: REM sleep or deep sleep?
I've been digging into the differences between REM and deep sleep because I feel like my recovery has been off lately. Deep sleep is where the real muscle repair happens, right? But I've also heard that REM sleep is crucial for cognitive function and mood, both of which affect my lifts. So, if I'm getting enough hours but struggling with sleep quality, should I prioritize one over the other for optimal recovery? Any science or personal experience to back this up would be appreciated.