Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine
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The objective of this secondary analysis was to evaluate concurrent validity of actigraphy and polysomnography (PSG) in older women with insomnia. ⋯ Actigraphy offers a relatively inexpensive and unobtrusive method for measuring sleep, but it appears to underestimate sleep disturbance, particularly at sleep efficiency levels below 73%, in older women with insomnia.
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Obstructive sleep apnea results from structural compromise of the upper airway and decreased muscle tone during sleep. Central sleep apnea is usually due to instability of the feedback mechanism of the body that controls respiration. While positional changes commonly affect the severity of obstructive sleep apnea, the effect of positional changes on the severity of central sleep apnea is less well known.