Deep sleep is extremely important for the glymphatic system. This is responsible for protein synthesis and muscle repair, which is why I'm always telling my athletes, we need to be monitoring deep sleep. If they're normally getting three hours of deep sleep, then we just really want to stay within that time range. We are optimizing for sleep the moment we wake up. So if you're doing things such as drinking alcohol, we know that that alcohol or ethanol is a sedative. It's going to completely block REM sleep and it's going to sedate us. so we need to stop drinking alcohol.