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In summary, although actigraphy is not as accurate as PSG for determining some sleep measurements, studies are in general agreement that actigraphy, with its ability to record continuously for long time periods, is more reliable than sleep logs which rely on the patients' recall of how many times they woke up or how long they slept during the night and is(More)
The ability to awaken oneself from sleep at a preselected time without external means (such as alarm clocks) was studied using, first, subjective and, second, objective methods. First, in a telephone survey of 269 unselected adults, over one-half said that they never use an alarm clock (or other external means) or always awaken before it. Another 24% said(More)
One cognitive ability that has been demonstrated in many people when asleep is the capacity to keep track of time sufficiently so that they can self-awaken when desired. Possible practical, physiological and evolutionary sources of this skill are outlined. Such findings help to establish the likely presence of significant cognitive ability when asleep.
The 2-week-old rat has frequently been reported to be hyperactive; however, the causes of this are disputed. In 3 experiments, with split-litter designs, the following possibilities were eliminated as causative factors: (a) body temperature; (b) nest seeking; and (c) maturation of peripheral sensory, motor, and endocrine systems. In contrast, the isolated(More)
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