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  • Title: Human plasma DSIP decreases at the initiation of sleep at different circadian times.
    Author: Seifritz E, Müller MJ, Schönenberger GA, Trachsel L, Hemmeter U, Hatzinger M, Ernst A, Moore P, Holsboer-Trachsler E.
    Journal: Peptides; 1995; 16(8):1475-81. PubMed ID: 8745061.
    Abstract:
    Nocturnal plasma delta sleep-inducing peptide-like immunoreactivity (DSIP-LI) was determined serially in seven healthy male subjects. Time courses during nocturnal sleep (2300-0800 h), nocturnal sleep deprivation (2300-0500 h), and morning recovery sleep (0500-0800 h) after sleep deprivation were compared. A significant decrease in plasma DSIP-LI was found at the transition from wakefulness to sleep in both evening sleep (2300 h) and morning recovery sleep (0500 h). Time courses were accompanied by physiological changes in sleep electroencephalographic slow-wave activity, and in plasma concentrations of cortisol and human growth hormone. No sleep stage specificity was found. It is concluded that DSIP is influenced by the initiation of sleep.
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