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Melatonin Rhythms in Delayed Sleep Phase Syndrome
Kayo Shibui
Makoto Uchiyama
Masako Okawa
Department of Psychophysiology, National Institute of Mental Health National Center of Neurology and Psychiatry, Chiba, Japan
The aim of this study was to compare circadian and sleep characteristics between patients with delayed sleep phase syndrome (DSPS) and healthy controls. The authors studied 8 DSPS patients and 15 normal controls. Serum melatonin concentration was assessed every hour for 24 h under dim light conditions. The sleep phase and the melatonin rhythm in DSPS patients were significantly delayed compared to those in normal controls. Sleep length was significantly greater in DSPS patients compared to that in controls, but the duration of melatonin secretion did not differ between the two groups. The final awakening, relative to melatonin onset, melatonin midpoint, and melatonin offset, was significantly longer in DSPS patients than in controls. By contrast, the timing of sleep onset relative to melatonin rhythm did not differ between the two groups. The authors found a significant positive correlation between sleep phase markers and melatonin phase markers in DSPS. They postulate that a delayed circadian pacemaker may be responsible for delayed sleep phase syndrome. The alteration of phase angle between melatonin rhythm and sleep phase suggested that not only the delay of the circadian clock but also a functional disturbance of the sleep-wake mechanism underlies DSPS.
Key Words: sleep disorder delayed sleep phase syndrome DSPS melatonin circadian rhythm light
Journal of Biological Rhythms, Vol. 14, No. 1,
72-76 (1999)
DOI: 10.1177/074873049901400110

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