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CONCEPTS OF CULTURE
SLEEP DREAMS AND THE BIOLOGICAL HOUR
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17-ketosteroids abnormal activity rhythm adapt adrenal hormones amino acid animals awaken began begin behavior Biorhythms blood body temperature catatonia cells changes circadian cycle circadian rhythm Clinical Endocrinology clock corticosterone cortisol creature darkness depression desynchronized disease diurnal dreams drugs effects emotional endocrine system Endocrinology enzyme excretion experience feel Franz Halberg free-running frequency functions gland Halberg hospital human hypothalamus individual infants influence internal isolation Journal of Clinical laboratory levels light live liver medicine melatonin menstrual menstrual cycle mental metabolism mice minutes mitosis monkeys mood morning nervous system night norepinephrine normal oscillation patients peak percent person phase shifts physiological pineal Pittendrigh pituitary plants potassium protein psychiatric pulse rats REM sleep researchers response rhythmic rodents schedule Science scientists seasons seems sense showed Stage IV sleep steroids stimulation stress studies symptoms synchronized temperature rhythm tests tion tissue twenty-four hours twenty-four-hour rhythm urine volunteers waking weeks