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Sharp waves and ripples. Sharp waves and ripples ( SWRs) are oscillatory patterns produced by extremely synchronised activity of neurons in the mammalian hippocampus and neighbouring regions which occur spontaneously in idle waking states or during NREM sleep. [1] They can be observed with a variety of imaging methods, such as EEG.
Slow-wave sleep. Slow-wave sleep ( SWS ), often referred to as deep sleep, is the third stage of non-rapid eye movement sleep (NREM), where electroencephalography activity is characterised by slow delta waves. [2] Slow-wave sleep usually lasts between 70 and 90 minutes, taking place during the first hours of the night. [3]
A K-complex is a waveform that may be seen on an electroencephalogram (EEG). It occurs during stage 2 NREM sleep. It is the "largest event in healthy human EEG". [1] They are more frequent in the first sleep cycles. K-complexes have two proposed functions: [1] first, suppressing cortical arousal in response to stimuli that the sleeping brain ...
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This spontaneous activity is classified into four main classifications based on the frequency of the activity, ranging from low frequency delta waves (< 4 Hz) commonly found during sleep to beta waves (13–30 Hz) associated with an awake and alert brain. In between these two extremes are theta waves (4–8 Hz) and alpha waves (8–12 Hz).
July 31, 2024 at 9:32 AM. Delta Air Lines CEO Ed Bastian says the airline is facing $500 million in costs related to a global tech outage this month that disrupted emergency services ...
July 22, 2024 at 7:27 PM. Three days after a computer update problem caused more than 5,000 flight cancellations around the world in a single day, things are pretty much back to normal — except ...
Irregular sleep–wake rhythm disorder ( ISWRD) is a rare form of circadian rhythm sleep disorder. [2] [3] It is characterized by numerous naps throughout the 24-hour period, no main nighttime sleep episode, and irregularity from day to day. [4] Affected individuals have no pattern of when they are awake or asleep, may have poor quality sleep ...