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Sleep Environment and Non-Rapid Eye Movement-Related Parasomnia Among Children: 42 Case Series

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Sleep Environment and Non-Rapid Eye Movement-Related Parasomnia Among Children: 42 Case Series pISSN 2093-9175 / eISSN 2233-8853 BRIEF COMMUNICATION https://doi.org/10.17241/smr.2020.00535 Sleep Environment and Non-Rapid Eye Movement-Related Parasomnia Among Children: 42 Case Series Joohee Lee, MD, Sungook Yeo, MD, Kyumin Kim, MD, Seockhoon Chung, MD, PhD Department of Psychiatry, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea The purpose of this study was to identify the clinical features related to sleep environment of non- rapid eye movement (NREM)-related parasomnia. It was a retrospective medical record review of 42 children. We investigated demographic information, sleep pattern, sleep environment, and the mother’s dysfunctional beliefs about the child’s sleep. The mean age of subjects was 6.3± 3.1. The diagnosis was night terror (n = 21), sleepwalking (n = 8), confusional arousal (n = 2), and unspeci- fied (n = 11). The average time of sleep pattern was as follow; bedtime 21:39± 0:54 pm, sleep onset time 22:13 ± 0:54 pm, wake-up time 7:37 ± 0:42 am and NREM-related parasomnia occurrence time 1:09 ± 2:04 am. The average number of co-sleeping members was 2.8. 48.5% (n = 16) mothers experienced coldness while sleeping, and 64.7% (n = 22) parents had dysfunctional beliefs about their children’s sleep. The large number of co-sleeping members, coldness mothers experienced while sleeping, and dysfunctional beliefs about their children’s sleep may influence the NREM-pa- rasomnia in children. Sleep Med Res 2020;11(1):49-52 Key WordsaaParasomnia, Sleep environment, Co-sleep, Children. INTRODUCTION Received: April 3, 2020 A significant number of children are impacted by sleep disorders, reported in 25–62% of Revised: April 27, 2020 Accepted: May 4, 2020 such children [1,2]. Among sleep disorders, parasomnia is more common in children than in Correspondence adults. Parasomnia is one of seven major categories of sleep disorders registered in the Inter- Seockhoon Chung, MD, PhD Department of Psychiatry, national Classification of Sleep Disorder (ICSD) [3]. Parasomnia is a phenomenon in which University of Ulsan College of Medicine, abnormal movements, behavior, emotional experiences occur that are not desired during Asan Medical Center, sleep or arousal. In ICSD-3, depending on the stage of sleep in which symptoms occur, para- 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea somnias were classified into three clusters: non-rapid eye movement (NREM)-related para- Tel +82-2-3010-3411 somnias, REM-related parasomnias, and other parasomnias. The sleeping environment con- Fax +82-2-485-8381 E-mail [email protected] ditions often influence the occurrence and severity of parasomnia by sleep disruption. Any conditions that impair sleep maintenance and promote NREM fragmentation could increase ORCID Joohee Lee the risk of parasomnias [4]. https://orcid.org/0000-0002-3114-1944 Co-sleeping, which is a natural part of parenting in Eastern cultures, would be one of the Sungook Yeo https://orcid.org/0000-0003-4127-3040 risk factors for sleep disruption in children. In the past, co-sleeping was an important means Kyumin Kim of survival to protect their children from danger such as predators, poisonous bugs, or even https://orcid.org/0000-0003-1203-1157 Seockhoon Chung other humans during the night. As civilization developed, humans built houses and segregat- https://orcid.org/0000-0002-9798-3642 ed family members into separate rooms. This change was accompanied by changes in the atti- cc This is an Open Access article distributed un- tude towards co-sleeping. It has become a matter of choice for parents. With this change, sev- der the terms of the Creative Commons Attribu- eral intense controversy over the hazards and benefits of bed-sharing emerged. The most tion Non-Commercial License (https://creative- commons.org/licenses/by-nc/4.0) which permits typical topic is the case of sudden infant death syndrome, and the American Academy of Pe- unrestricted non-commercial use, distribution, diatrics issued guidelines warning against bed-sharing [5]. In Eastern cultures, co-sleeping re- and reproduction in any medium, provided the original work is properly cited. mains highly prevalent. Several interesting factors such as positive maternal attitudes towards Copyright © 2020 The Korean Society of Sleep Medicine 49 Sleep Environment and NREM Parasomnia co-sleeping, number of children, and poor child health were RESULTS associated with an increased incidence of co-sleeping [6,7]. Recent studies have reported that co-sleeping has adverse ef- fects on infants’ sleep and increases arousal [7,8]. The mean age of subjects was 6.3± 3.1, and 27 (64.3%) chil- The influence of the bedroom environment is also critical. dren were males (Table 1). In sibling orders, the first child was Sleep disruption can be triggered by poor sleep hygiene, in- the most common with 24 children (57.1%) followed by 11 cluding bright light, excessive noise, extreme temperature, second-born (26.2%) and one third-born (2.4%). The diagno- mattress, and so on [9]. Last, the mothers’ dysfunctional belief sis was night terror (n = 21, 50.0%), sleepwalking (n = 8), con- in their children’s sleep can negatively impact the child’s sleep fusional arousal (n = 2), and unspecified (n = 11). The average problems. For example, “If you don’t sleep well, you won’t be time of sleep pattern was as follow; bedtime 21:39 ± 0:54 pm, tall” or “If you talk nonsense while asleep, you have a mental problem” are typical concerns of parents. The parent’s dysfunc- Table 1. Demographic variables of 42 non-REM related parasom- nia cases tional belief could make a child’s sleep problem more severe and may terrorize the mother as well as the child. Of course, Variables Subjects (n = 42) there is a relationship between sleep with growth hormone and Sex (male) 27 (64.3) sleep problems in children with developmental delay, but it Sibling order cannot be reversed. 1st/2nd/3rd 24 (57.1) / We hypothesized that factors related to the sleeping environ- 11 (26.2) / 1 (2.4) ment may affect the occurrence or progression of parasomnia. Diagnosis The purpose of this study was to identify the clinical features re- Confusional arousal 2 (4.8) lated to the sleep environment of childhood-onset NREM-relat- Night terror 21 (50.0) ed parasomnia and to develop a nonpharmacological treatment. Sleep walking 8 (19.0) Unspecified 11 (26.2) METHODS Age (year) 6.3 ± 3.1 Family members (person) 4.1 ± 0.8 This study design was a retrospective review of the medical Persons in a room while sleeping (co-sleeping) 2.8 ± 1.0 records of pediatric patients younger than age 18 diagnosed Data are presented as n (%) or mean ± standard deviation. with parasomnia. Forty-two children with parents, who had visited the Pediatric Sleep Clinic at Asan Medical Center July 1, Table 2. Clinical characteristics of 42 non-REM related parasom- 2018–June 30, 2019, were included in this study. Cases with neu- nia cases rological damage, neurological diseases, or sleep difficulties -at Variables Subjects (n = 42) tributable to other major mental illnesses such as psychosis and Bedtime 21:39 ± 0:54 pm neurosis, were excluded from this study. The following infor- ± mation was reviewed through retrospective review of medical Sleep onset time 22:13 0:54 pm records: demographic information, the sleep pattern (bedtime, Wake-up time 7:37 ± 0:42 am sleep onset time, wake-up time, naps), symptoms of parasomnias, Parasomnia event time 1:09 ± 2:04 am the environmental sleep conditions (noise, brightness, room Night sweats of children 12/33 (36.4) temperature, humidity, activities before bedtime), co-sleep en- Mothers who experienced coldness while sleeping 16/33 (48.5) vironment condition (the number of people sharing a room at Dysfunctional beliefs of mothers about their 22/34 (64.7) bedtime, patient’s night sweats, if the co-sleeping mother expe- children’s sleep riences coldness while sleeping) and mothers’ dysfunctional Children taking a nap 16/36 (44.4) beliefs about the relationship between sleep and growth. Based Children reporting noise complaints 3/34 (8.8) on the above data, we reviewed the clinical features of parasom- Children reporting that the sleeping space nias. SPSS version 21.0 software (IBM Corp., Armonk, NY, 8/34 (23.5) USA) was used for the statistical analysis. Statistical signifi- brightness problems Children reporting room temperature or cance was defined by a p value < 0.05. This study was approved 12/33 (36.4) by the Institutional Review Board of Asan Medical Center (IRB humidity complaints No. 2019-0954), which waived the requirement for informed Children with acute stressors 10/34 (29.4) consent. Children with poor hygiene activities bedtime 5/27 (18.5) (TV, smart phone) Data are presented as n (%) or mean ± standard deviation. 50 Sleep Med Res 2020;11(1):49-52 Lee J, et al. sleep onset time 22:13 ± 0:54 pm, wake-up time 7:37 ± 0:42 co-sleepers showed more frequent awakening than solitary- am and NREM-related parasomnia event time 1:09 ± 2:04 am sleepers [11]. Other studies using the polysomnography of (Table 2). The average number of family members and persons mother-infants have reported that bed-sharing promoted infant in a room while sleeping (co-sleep) was 4.1 and 2.8, respectively. arousal as well as an arousal of the mother [11-13]. Twelve of 33 (36.4%) children reported night sweats, while 16 In this study, we observed that children diagnosed with pa- of 33 (48.5%) mothers experienced coldness while sleeping to- rasomnia perspired at night, but the mothers experienced gether. Among the parents of the subjects, 22 (64.7%) parents coldness.
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