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  2. Why do I wake up at 3 a.m. every night? - AOL

    www.aol.com/keep-waking-middle-night-could...

    Falling asleep and waking up at the same time every day, as well as getting natural light exposure throughout the day and dimming artificial lights at night, will help strengthen your circadian ...

  3. Waking at the same time each night reveals details ... - AOL

    www.aol.com/article/2016/07/14/waking-at-the...

    If you want to give it a try, they're offering a risk-free 100-night trial guarantee that every night is full of slumber, or you get your money back. Try it today, and get $50 off any mattress ...

  4. Polyphasic sleep - Wikipedia

    en.wikipedia.org/wiki/Polyphasic_sleep

    The naps would not be placed equiphasically, instead occurring more densely during night hours. [26] The U.S. military has studied fatigue countermeasures. An Air Force report states: Each individual nap should be long enough to provide at least 45 continuous minutes of sleep, although longer naps (2 hours) are better.

  5. Is 4 hours of sleep enough? What sleeping too little does to ...

    www.aol.com/news/4-hours-sleep-enough-sleeping...

    Consistency is key, the experts note, which means going to sleep at or around the same time every night. "Waking up at the same time every day is also super important so you can start building up ...

  6. Paroxysmal nocturnal dyspnoea - Wikipedia

    en.wikipedia.org/wiki/Paroxysmal_nocturnal_dyspnoea

    With paroxysmal nocturnal dyspnea specifically, it is felt while sleeping and causes a person to wake up after about 1 to 2 hours of sleep. [ 3 ] More serious forms of dyspnea can be identified through accompanying findings, such as low blood pressure, decreased respiratory rate, altered mental status, hypoxia, cyanosis, stridor, or unstable ...

  7. Advanced sleep phase disorder - Wikipedia

    en.wikipedia.org/wiki/Advanced_sleep_phase_disorder

    Individuals with FASPS fall asleep and wake up 4–6 hours earlier than the average population, generally sleeping from 7:30pm to 4:30am. They also have a free running circadian period of 22 hours, which is significantly shorter than the average human period of slightly over 24 hours. [ 6 ]

  8. Is 7 hours of sleep a night enough? Sleep doctors weigh in - AOL

    www.aol.com/7-hours-sleep-night-enough-224251397...

    Some adults need nine or 10 hours of sleep every night to feel rested, says Harris, whereas others may find they only need seven, and sleeping more isn’t necessarily better.

  9. Delayed sleep phase disorder - Wikipedia

    en.wikipedia.org/wiki/Delayed_sleep_phase_disorder

    It consists of going to bed two or more hours later each day for several days until the desired bedtime is reached, and it often must be repeated every few weeks or months to maintain results. Its safety is uncertain, [41] notably because it has led to the development of non-24-hour sleep-wake rhythm disorder, a much more severe disorder. [9]