Psychometric assessment of subjective sleep quality using the Japanese version of the Pittsburgh Sleep Quality Index (PSQI-J) in psychiatric disordered and control subjects
Association of structural polymorphisms in the human period3 gene with delayed sleep phase syndrome
The results suggest that structural polymorphisms in the hPer3 gene may be implicated in the pathogenesis of DSPS, and one of the haplotypes was significantly associated with DSPS.
Sleep loss and daytime sleepiness in the general adult population of Japan
Melatonin Rhythms in 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 delayed sleep phase syndrome.
Relation between morningness-eveningness score and depressive symptoms among patients with delayed sleep phase syndrome.
Prevalence and correlates of sleep problems in Chinese schoolchildren.
Parent-reported sleep problems in Chinese children were less prevalent than those reported in Western countries, and associated with multiple family, prenatal, and child developmental factors.
Mutation screening of the human Clock gene in circadian rhythm sleep disorders
A Missense Variation in Human Casein Kinase I Epsilon Gene that Induces Functional Alteration and Shows an Inverse Association with Circadian Rhythm Sleep Disorders
Results indicate that the N408 allele in CKIɛ plays a protective role in the development of DSPS and N-24 through alteration of the enzyme activity.
Dreaming during non-rapid eye movement sleep in the absence of prior rapid eye movement sleep.
The results suggest that the polysomnographic manifestations of REM sleep are not required for dream experiences but that the mechanisms driving REM sleep alter experiences during NREM sleep in the morning.