BRAIN FM 

Deep sleep is a critical stage of sleep that's characterized by: 
Slowed brain waves: Also known as delta waves, these are the slowest brain waves you experience. 
Slowed breathing and heartbeat: Your breathing and heartbeat are at their lowest and most regular during deep sleep. 
Relaxed muscles: Your muscles are relaxed during deep sleep. 
Difficulty waking up: It can be very difficult to wake someone from deep sleep. 
Groginess when waking up: You might feel a little confused if you're woken up during deep sleep. This is called sleep inertia. 
Deep sleep is also known as slow-wave sleep (SWS) or delta sleep. It's the third stage of non-rapid eye movement (NREM) sleep. You'll get most of your deep sleep in the first half of the night. 
Deep sleep is important for: 
Repairing the brain and body: Deep sleep allows your brain to recover from the day's activity. 

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