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  2. Circadian clock - Wikipedia

    en.wikipedia.org/wiki/Circadian_clock

    In vertebrates, the master circadian clock is contained within the suprachiasmatic nucleus (SCN), a bilateral nerve cluster of about 20,000 neurons. [10] [11] The SCN itself is located in the hypothalamus, a small region of the brain situated directly above the optic chiasm, where it receives input from specialized photosensitive ganglion cells in the retina via the retinohypothalamic tract.

  3. Basic rest–activity cycle - Wikipedia

    en.wikipedia.org/wiki/Basic_rest–activity_cycle

    The basic rest–activity cycle (BRAC) is a physiological arousal mechanism in humans proposed by Nathaniel Kleitman, [1] hypothesized to occur during both sleep and wakefulness. Empirically, it is an ultradian rhythm of approximately 90 minutes (80–120 minutes [ 2 ] ) characterized by different levels of excitement and rest.

  4. Circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm

    A circadian rhythm (/ s ər ˈ k eɪ d i ə n /), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours.Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment (is entrained by the environment).

  5. 30 sleepover activities to keep the party going all night long

    www.aol.com/news/30-sleepover-activities-keep...

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  6. Date Night on $25: 8 Activities To Do and Places To Go - AOL

    www.aol.com/date-night-25-8-activities-100004026...

    Is it possible to have a fabulous date night for two on a $25 budget? Yes! $25 goes a surprisingly long way in creating memorable date moments during the day, afternoon and well into the...

  7. Diurnal cycle - Wikipedia

    en.wikipedia.org/wiki/Diurnal_cycle

    A diurnal cycle (or diel cycle) is any pattern that recurs every 24 hours as a result of one full rotation of the planet Earth around its axis. [1] Earth's rotation causes surface temperature fluctuations throughout the day and night, as well as weather changes throughout the year. The diurnal cycle depends mainly on incoming solar radiation. [2]

  8. Celebrate Earth Day with These Fun Activities for Kids and Adults

    www.aol.com/lifestyle/celebrate-earth-day-fun...

    Rent, borrow, or buy a projector, set up a DIY screen and embrace the outdoors on Earth Day evening with this unique activity that's better than a drive-in movie since it happens right in your own ...

  9. Sleep cycle - Wikipedia

    en.wikipedia.org/wiki/Sleep_cycle

    Schematic illustration of a normal sleep cycle. The standard figure given for the average length of the sleep cycle in an adult man is 90 minutes. N1 (NREM stage 1) is when the person is drowsy or awake to falling asleep. Brain waves and muscle activity start to decrease at this stage. N2 is when the person experiences a light sleep.