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  2. Nocturnal penile tumescence - Wikipedia

    en.wikipedia.org/wiki/Nocturnal_penile_tumescence

    A full bladder is known to mildly stimulate nerves in the same region. The possibility of a full bladder causing an erection, especially during sleep, is perhaps further supported by the beneficial physiological effect of an erection inhibiting urination, thereby helping to avoid nocturnal enuresis [ citation needed ] .

  3. Is Waking Up in the Middle of the Night Normal? Here's What ...

    www.aol.com/waking-middle-night-normal-heres...

    While a full night of uninterrupted sleep is the goal for many, it’s not uncommon to wake up at least once in the middle of the night. In fact, most people wake up two to three times throughout ...

  4. How to Get Back to Sleep After Waking Up at Night - AOL

    www.aol.com/back-sleep-waking-night-160332950.html

    Pay attention to whether any of these are waking you up at night, and make adjustments accordingly. For example, if you always wake up because the sun peeks in at 5 a.m., hang up blackout curtains.

  5. Sleep - Wikipedia

    en.wikipedia.org/wiki/Sleep

    The primary difference appears to be that pre-light cultures have more broken-up sleep patterns. For example, people without artificial light might go to sleep far sooner after the sun sets, but then wake up several times throughout the night, punctuating their sleep with periods of wakefulness, perhaps lasting several hours. [140]

  6. Polyphasic sleep - Wikipedia

    en.wikipedia.org/wiki/Polyphasic_sleep

    Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic, bifurcated, or bimodal) sleep refers to two periods, while polyphasic usually means more than two. [1]

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

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

    There's a theory that states that waking at a certain time of night is actually a signal from your body about something going on inside. As you sleep, your body undergoes many states of activity.

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

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

    Waking up in the middle of the night is common, but it could be a problem when you find yourself not going back to sleep right away. Waking up in the middle of the night is common, but it could be ...

  9. Waking up early - Wikipedia

    en.wikipedia.org/wiki/Waking_up_early

    Teenagers tend to require at least 9 full hours of sleep each night, [11] and changes to the endocrine system during puberty shift the natural wake time later in the morning. [12] Enforcing early start times despite this can have negative effects on mood, academic performance, and social skills. [13] [14]