Understanding 6 Common Sleep Disorders
During normal sleep, you cycle through REM and four stages of non-REM (NREM) sleep numerous times a night. Stage 1 of NREM sleep is the lightest, while stage 4 is the deepest.

When you're repeatedly interrupted and can't cycle normally through these types and stages of sleep, you may feel tired, fatigued, and have trouble concentrating and paying attention while you're awake.

Let's look into 6 common sleep disorders:

Source:
https://www.webmd.com/sleep-disorders/understanding-sleep-problems-basics
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