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Delayed sleep phase disorder. Delayed sleep phase disorder ( DSPD ), more often known as delayed sleep phase syndrome and also as delayed sleep–wake phase disorder, is the delaying of a person's circadian rhythm (biological clock) compared to those of societal norms. The disorder affects the timing of biological rhythms including sleep, peak ...
Things that can cause fragmented sleep include disorders like sleep apnea, as well as taking antidepressants, being in a noisy environment and having an irregular sleep schedule.
Epileptic seizure, nightmares. Night terror, also called sleep terror, is a sleep disorder causing feelings of panic or dread and typically occurring during the first hours of stage 3–4 non-rapid eye movement (NREM) sleep [1] and lasting for 1 to 10 minutes. [2] It can last longer, especially in children. [2]
Polysomnography (PSG) is a multi-parameter type of sleep study [1] and a diagnostic tool in sleep medicine.The test result is called a polysomnogram, also abbreviated PSG.The name is derived from Greek and Latin roots: the Greek πολύς (polus for "many, much", indicating many channels), the Latin somnus ("sleep"), and the Greek γράφειν (graphein, "to write").
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The 484 participants (242 individuals with polysomnogram-confirmed RBD and 242 controls) completed the screen. Dream-enactment behavior was established by history or video recording, and the absence of REM sleep muscle paralysis (atonia) was confirmed by polysomnogram, according to the International Classification of Sleep Disorders-2.
After years of investing in self-checkouts, Five Below, Dollar General and others are refocusing on human cashiers, citing long-running concerns about lost inventory.
Stage 2 – no eye movement occurs, and dreaming is very rare. The sleeper is quite easily awakened. EEG recordings tend to show characteristic "sleep spindles", which are short bursts of high frequency brain activity, and "K-complexes" during this stage. Stage 3 – previously divided into stages 3 and 4, is deep sleep, slow-wave sleep (SWS).