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1. www.webmd.com › sleep-disorders › sleep-apneaSleep Apnea: Types, Causes, Risk Factors, Effects on Health ...

   www.webmd.com › sleep-disorders › sleep-apnea

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   2024年3月14日 · High blood pressure or heart problems. Sudden drops in blood oxygen levels while you sleep can raise your blood pressure and put stress on your cardiovascular system. Obstructive sleep apnea could ...

2. www.webmd.com › oral-health › tooth-discolorationYellow Teeth and Other Discoloration: Causes and Treatments ...

   www.webmd.com › oral-health › tooth-discoloration

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   2023年4月4日 · There are several causes of tooth discoloration, including: Foods/drinks. Coffee, tea, colas, wines, and certain fruits and vegetables (for example, apples, and potatoes) can stain your teeth ...

3. www.webmd.com › sleep-disorders › sleep-101Stages of Sleep: REM and Non-REM Sleep Cycles - WebMD

   www.webmd.com › sleep-disorders › sleep-101

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   2022年11月16日 · Stage 1: Your eyes are closed, but it's easy to wake you up. This phase may last for 5 to 10 minutes. Stage 2: You are in light sleep. Your heart rate slows and your body temperature drops. Your ...