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For the purposes of sleep studies, episodes of full upper airway collapse for at least ten seconds are called apneas. [90] Sleep paralysis, characterized by temporary paralysis of the body shortly before or after sleep. Sleep paralysis may be accompanied by visual, auditory or tactile hallucinations. It is not a disorder unless severe, and is ...
Other sleep related disorders like sleep apnea are ruled out by examining the patients' respiratory effort, air flow, and oxygen saturation. RMD patients often show no abnormal activity that is directly the result of the disorder in an MRI scan. [7] RMD episodes are strongly associated with stage 2 NREM sleep and, specifically, K Complexes [8].
Hori et al. regard sleep onset hypnagogia as a state distinct from both wakefulness and sleep with unique electrophysiological, behavioral and subjective characteristics, [10] [12] while Germaine et al. have demonstrated a resemblance between the EEG power spectra of spontaneously occurring hypnagogic images, on the one hand, and those of both ...
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Further research into crackling noise was done in the late 1940s by Charles Francis Richter and Beno Gutenberg who examined earthquakes analytically. Before the invention of the well-known Richter scale, the Mercalli intensity scale was used; this is a subjective measurement of how damaging an earthquake was to property, i.e. II would be small vibrations and objects moving, while XII would be ...
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Sleeping supine (on one's back) is also represented as a risk factor for OSA. Clearly, gravity and loss of tongue and throat tone as a person enters deep sleep are clear and obvious factors contributing to OSA developing. But this explanation is also confounded by the presence of neck obesity.