Often seen in people as they are preparing to fall asleepĪpnea – A period of breathing cessation that can occur during sleep if the airway of the sleeper becomes obstructed.īenzodiazepine – A type of medication that is frequently used in sleep aids.īeta Activity – This is the type of brainwave that generally indicates full wakefulness.īrainwaves – These are the patterns made by the electrical activity in our brains that can be recorded using electroencephalography (EEG). This test can be done offsite at home using a wrist-watch style actimeter or in a sleep lab.Īdvanced Sleep Phase Syndrome – This is a sleep disorder that makes people wake up earlier and fall asleep earlier than the average person.Īlpha Activity – This is the type of brainwave that generally signifies that someone is awake but relaxed. So, we wanted to cover some of the more commonly used sleep terminology.Īctigraphy – The practice of using data about body movement during sleep to determine sleep/wakefulness patterns as part of a sleep assessment. Sometimes it can be confusing to understand all of the terms used when talking about sleep. Objectively assessed infant sleep that is comparable across different studies supports the establishment of normative developmental trajectories and clinical cutoffs.If all the terms surrounding sleep can get a little confusing, these definitions may help. Conclusions: These adjustments enhance comparability between infant actimetry studies and the inclusion of parent-reported diaries allows the integration of daytime sleep. Total Sleep Duration from 4.5 to 0.2 hours. This decreased the difference in estimated sleep behaviors, e.g. By introducing a six-step adjustment, we increased agreement between algorithms (96%-97%) and with the diary. Results: Agreement between uncorrected algorithms was moderate (77%-84%). We compared minute-by-minute agreement and Kappa between the two algorithms, as well as the algorithms with sleep/wake measures from a comprehensive 24-hour parent-reported diary. We analyzed the infants' sleep/wake behaviors by applying two algorithms: Sadeh and Oakley/Respironics. Methods: We used actimetry in 50 infants for 10 continuous days at ages 3, 6, and 12 months in a longitudinal approach. Thus, we evaluate the comparability of two commonly used actimetry algorithms in infants and propose adjustments to increase comparability. Nevertheless, the standardization of actimetry-based sleep/wake measures is limited by two factors: the use of different computational approaches and the bias towards measuring only nighttime sleep-neglecting ~20 % of sleep infants obtain during daytime. Actimetry is a cost-efficient method to objectively estimate infant sleep/wake behavior from limb movements. This is important for clinical practice as well as basic research. Abstract : Study Objectives: Only standardized objective assessments reliably capture the large variability of sleep behavior in infancy, which is the most pronounced throughout the human lifespan.
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