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  2. Neuroscience of sleep - Wikipedia

    en.wikipedia.org/wiki/Neuroscience_of_sleep

    During this period, the thalamus stops relaying sensory information to the brain, however it continues to produce signals, such as spindle waves, that are sent to its cortical projections. Sleep spindles of slow wave sleep are generated as an interaction of the thalamic reticular nucleus with thalamic relay neurons. [71]

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

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

    Known as slow-wave sleep or stage 3 non-REM sleep, this is the deepest stage of sleep and the hardest to wake up from. Brain activity slows down, muscles and bones strengthen, hormones regulate ...

  4. Neural oscillation - Wikipedia

    en.wikipedia.org/wiki/Neural_oscillation

    Sleep stages are characterized by spectral content of EEG: for instance, stage N1 refers to the transition of the brain from alpha waves (common in the awake state) to theta waves, whereas stage N3 (deep or slow-wave sleep) is characterized by the presence of delta waves. [107] The normal order of sleep stages is N1 → N2 → N3 → N2 → REM.

  5. Unihemispheric slow-wave sleep - Wikipedia

    en.wikipedia.org/wiki/Unihemispheric_slow-wave_sleep

    A young house sparrow (Passer domesticus) exhibits unihemispheric slow-wave sleep. Unihemispheric slow-wave sleep (USWS) is sleep where one half of the brain rests while the other half remains alert. This is in contrast to normal sleep where both eyes are shut and both halves of the brain show unconsciousness.

  6. K-complex - Wikipedia

    en.wikipedia.org/wiki/K-complex

    They are generated in widespread cortical locations [1] though they tend to predominate over the frontal parts of the brain. [5] Both K-complex and delta wave activity in stage 2 sleep create slow-wave (0.8 Hz) and delta (1.6–4.0 Hz) oscillations. However, their topographical distribution is different, and the delta power of K-complexes is ...

  7. Sleep - Wikipedia

    en.wikipedia.org/wiki/Sleep

    Sleep deprivation tends to cause slower brain waves in the frontal cortex, shortened attention span, higher anxiety, impaired memory, and a grouchy mood. Conversely, a well-rested organism tends to have improved memory and mood. [37]

  8. Rapid eye movement sleep - Wikipedia

    en.wikipedia.org/wiki/Rapid_eye_movement_sleep

    The cortical and thalamic neurons in the waking and REM sleeping brain are more depolarized (fire more readily) than in the NREM deep sleeping brain. [10]: §8.1 232–243 Human theta wave activity predominates during REM sleep in both the hippocampus and the cortex. [12] [13]

  9. Sleep cycle - Wikipedia

    en.wikipedia.org/wiki/Sleep_cycle

    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. Eye movement has stopped by this time. Brain wave frequency and muscle tonus is decreased. The heart rate and body temperature also goes down.