title: [Effects of ramelteon on a patient with circadian rhythm sleep disorder and mood disorder].
abstract: Ramelteon is a novel hypnotic characterized by its action as a melatonin receptor (MT1/MT2) agonist. It has been reported that ramelteon can alter the phase of the sleep period. We report a patient with circadian rhythm sleep disorder and mood disorder who improved with ramelteon. A 25-year-old man had a 5-year history of emotional instability, excessive daytime sleepiness, and difficulty awakening. He had been diagnosed with mood disorder and narcolepsy by a psychiatrist. Sertraline, milnacipran, valproate, and methylphenidate were ineffective, and so he presented to our hospital. Interview data and a sleep log demonstrated a delayed sleep phase. As other examinations such as actigraphy and video-polysomnography indicated no other diseases, the patient was diagnosed with circadian rhythm sleep disorder, delayed sleep phase type (ICSD-2). In addition, his mental symptoms were consistent with the criteria for cyclothymia (ICD-10). After the administration of ramelteon, the phase of his sleep period gradually advanced and his emotional instability improved. Because of the high rate of comorbidity between these two diseases, we should be aware of circadian rhythm sleep disorders that are masked by mood disorders.
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Yoshihara
authors.forename: Mondo
authors.initials: M
authors.lastname: Yoshizawa
authors.forename: Ayaka
authors.initials: A
authors.lastname: Shirata
authors.forename: Mika
authors.initials: M
authors.lastname: Matsuda
authors.forename: Motoyuki
authors.initials: M
authors.lastname: Tamashiro
authors.forename: Ichiro
authors.initials: I
authors.lastname: Saito
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Sakamoto
authors.forename: Yota
authors.initials: Y
authors.lastname: Fujimura
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Tamura
authors.forename: Shigeru
authors.initials: S
authors.lastname: Chiba
mesh_terms: D056044:Actigraphy; D000328:Adult; D006801:Humans; D007192:Indenes / Q000627:therapeutic use*; D008297:Male; D019964:Mood Disorders / Q000150:complications / Q000188:drug therapy*; D020178:Sleep Disorders, Circadian Rhythm / Q000150:complications / Q000188:drug therapy*
chemical_list: D007192:Indenes; C495910:ramelteon