| http://www.w3.org/ns/prov#value | - tency - time period measured from lights out, or bedtime, to the beginning of sleep Sleep log (-diary) - daily, written record of an individual's sleep-wake pattern containing such information as time of retiring and arising, time in bed, estimated total sleep period, number and duration of sleep interruptions, quality of sleep, daytime naps, use of medications or caffeine beverages, nature of w
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