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Effect of short duration morning bright light in elderly men: Sleep structure
Author(s) -
Kohsaka Masako,
Fukuda Noriko,
Kobayashi Riko,
Honma Hiroshi,
Sakakibara Satoshi,
Koyama Emi,
Nakano Toshio,
Matsubara Hozumi
Publication year - 2000
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1046/j.1440-1819.2000.00718.x
Subject(s) - morning , sleep (system call) , audiology , medicine , duration (music) , sleep stages , psychology , ophthalmology , anesthesia , polysomnography , physics , computer science , acoustics , operating system , apnea
Sleep structure was measured in five healthy elderly men in their homes. The subjects were exposed to bright light (6000 lx) for 30 min in the morning or instructed to sit in front of a desktop lighting device without light. Relative to the control conditions, bright light exposure significantly decreased time in bed and the number of awakenings. Rapid eye movement sleep was significantly fragmented by stage 1 sleep in the control condition compared with the bright light condition. These findings indicate that a short duration of morning bright light changes sleep structure and is effective in maintaining sleep.