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  2. Feeling so tired all the time? Iron deficiency might be the ...

    www.aol.com/lifestyle/feeling-tired-time-iron...

    There’s a few different routes that can be taken to restore healthy iron levels in the body. Choosing the right treatment will depend on the cause of the iron deficiency, and whether there are ...

  3. This is the reason you feel tired all of the time - AOL

    www.aol.com/reason-feel-tired-time-062200614.html

    IN FOCUS: It’s common to feel run down at this time of year, writes Olivia Petter. But how can we start to combat constant feelings of fatigue?

  4. What Is Deep Sleep? Understanding the 4 Sleep Cycles & Why ...

    www.aol.com/deep-sleep-understanding-4-sleep...

    Deep sleep refers to slow-wave sleep — a stage in the sleep cycle when brain waves slow down. Getting enough deep sleep is crucial for numerous bodily functions.

  5. Excessive daytime sleepiness - Wikipedia

    en.wikipedia.org/wiki/Excessive_daytime_sleepiness

    EDS can be a symptom of a number of factors and disorders. Specialists in sleep medicine are trained to diagnose them. Some are: Insufficient quality or quantity of night time sleep [5] Obstructive sleep apnea [6] Misalignments of the body's circadian pacemaker with the environment (e.g., jet lag, shift work, or other circadian rhythm sleep ...

  6. Neuroscience of sleep - Wikipedia

    en.wikipedia.org/wiki/Neuroscience_of_sleep

    NREM sleep itself is divided into multiple stages – N1, N2 and N3. Sleep proceeds in 90-minute cycles of REM and NREM, the order normally being N1 → N2 → N3 → N2 → REM. As humans fall asleep, body activity slows down. Body temperature, heart rate, breathing rate, and energy use all decrease. Brain waves slow down.

  7. Sleep inertia - Wikipedia

    en.wikipedia.org/wiki/Sleep_inertia

    Sleep inertia is a physiological state of impaired cognitive and sensory-motor performance that is present immediately after awakening. It persists during the transition of sleep to wakefulness, where an individual will experience feelings of drowsiness, disorientation and a decline in motor dexterity.

  8. Do You Always Wake Up Tired? Here’s Why, According to ... - AOL

    www.aol.com/lifestyle/always-wake-tired-why...

    Waking up tired is often due to sleep inertia, but sleep environment and habits also play a part. Here, doctors provide tips for waking up refreshed. Skip to main content. 24/7 Help ...

  9. Sleep deprivation - Wikipedia

    en.wikipedia.org/wiki/Sleep_deprivation

    Also not accounted for in nearly all of the studies is that acute REM sleep deprivation induces lasting (> 20 days) neuronal apoptosis in mice, and the apoptosis rate increases on the day following its end, so the amount of apoptosis is often undercounted in mice because experiments nearly always measure it the day the sleep deprivation ends. [37]

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