Dream Recall Frequency and Sleep in Patients with Rapid Eye Movement Sleep Behavior Disorder

Abstract

Objectives: The dream recall and sleep of patients with rapid eye movement sleep behavior disorder (RBD) were not sufficiently studied. We hypothesized that RBD patients have frequent dream recall with poor sleep quality, and investigated the relationship between the dream recall frequency and sleep quality in RBD patients compared to controls. Methods: We analyzed 81 drug naïve patients [RBD (+), 64.6±8.3 y, 57 males] and 81 age and gender matched patients with sleep disturbances without RBD [RBD (-), 63.7±7.3 y, 57 males]. All completed Pittsburgh sleep quality index (PSQI), insomnia severity index (ISI), Epworth sleepiness scale and Beck depression inventory. The 5-point rating scale was used to categorize dream recall frequency of most recent month (0=never, 4=very frequent). Results: In RBD (+), dream recall frequency was much higher [frequent dreaming, 77.2% vs. 35.4%], and subjective sleep quality was much better [PSQI, 6.36±3.26 vs. 8.71±4.69]. Insomnia severity was much less in RBD (+) (ISI, 9.13±5.86) than RBD (-) (12.43±7.62). No significant differences were found in sleep parameters except lower N2 sleep % in RBD (+). The relationship between dream recall frequency and sleep was not significant in RBD (+), yet, a positive correlation was noted in RBD (-). Conclusions: RBD (+) had better sleep quality despite higher frequency of dream recall compared to RBD (-). Also dream recall was not related to their sleep quality in RBD (+), which suggests that RBD patients may have different sleep perception about their sleep and sleep quality. J Sleep Med 2017;14(2):55-60 Key Words: REM sleep behavior disorder, Sleep quality, Dream recall frequency. 렘수면행동장애-는렘수면동안정상적으로발생하는골격근의 무긴장증이소실되어꿈내용을행동화하는질환이 다 렘수면행동장애는일반적으로대이상의중장년층에 서발생하며남자에서빈도가높다 는신경퇴행성질환인파킨슨병' 루이소체치매다발성신경계 위축증등과관련성이높으며특 히파킨슨병의전구질환으로보고하는연구가많다 환자의꿈은난폭하고생생하며싸우거나도망치는 내용이특징이다 일반적으로난폭하거나동물이등장하는 꿈은성인보다는소아에서더높은빈도로관찰된다 연령 이증가할수록위협회피기술이향