Editing Sleep disorder (section)

=== Children and young adults ===
According to one meta-analysis of sleep disorders in children, [[confusional arousals]] and [[sleepwalking]] are the two most common sleep disorders among children.<ref name=":1">{{cite journal | vauthors = Carter KA, Hathaway NE, Lettieri CF | title = Common sleep disorders in children | journal = American Family Physician | volume = 89 | issue = 5 | pages = 368–377 | date = March 2014 | pmid = 24695508 | url = http://www.aafp.org/afp/2014/0301/p368.html }}</ref> An estimated 17.3% of kids between 3 and 13 years old experience confusional arousals.<ref name=":1" /> About 17% of children sleepwalk, with the disorder being more common among boys than girls,<ref name=":1" /> the peak ages of sleepwalking are from 8 to 12 years old.<ref name=":1" />

A different systematic review offers a high range of prevalence rates of [[Bruxism|sleep bruxism]] for children. Parasomnias like sleepwalking and talking typically occur during the first part of an individual's sleep cycle, the first slow wave of sleep <ref>{{cite journal | vauthors = Carter KA, Hathaway NE, Lettieri CF | title = Common sleep disorders in children | journal = American Family Physician | volume = 89 | issue = 5 | pages = 368–377 | date = March 2014 | pmid = 24695508 | url = https://pubmed.ncbi.nlm.nih.gov/24695508/ }}</ref> During the first slow wave of sleep period of the sleep cycle the mind and body slow down causing one to feel drowsy and relaxed. At this stage it is the easiest to wake up, therefore many children do not remember what happened during this time.

Nightmares are also considered a parasomnia among children, who typically remember what took place during the nightmare. However, nightmares only occur during the last stage of sleep - [[Rapid eye movement sleep|Rapid Eye Movement (REM)]] sleep. REM is the deepest stage of sleep, it is named for the host of neurological and physiological responses an individual can display during this period of the sleep cycle which are similar to being awake'''.<ref>{{cite book| vauthors = Patel AK, Reddy V, Shumway KR, Araujo AF | chapter = Physiology, Sleep Stages |date=2021| chapter-url = http://www.ncbi.nlm.nih.gov/books/NBK526132/| title = StatPearls|place=Treasure Island (FL)|publisher=StatPearls Publishing|pmid=30252388|access-date=2021-09-19}}</ref>'''

Between 15.29% and 38.6% of preschoolers grind their teeth at least one night a week. All but one of the included studies reports decreasing [[Bruxism|bruxist]] prevalence as age increased, as well as a higher prevalence among boys than girls.<ref>{{cite journal | vauthors = Machado E, Dal-Fabbro C, Cunali PA, Kaizer OB | title = Prevalence of sleep bruxism in children: a systematic review | journal = Dental Press Journal of Orthodontics | volume = 19 | issue = 6 | pages = 54–61 | date = 2014 | pmid = 25628080 | pmc = 4347411 | doi = 10.1590/2176-9451.19.6.054-061.oar }}</ref>

Another systematic review noted 7-16% of young adults have [[delayed sleep phase disorder]]. This disorder reaches peak prevalence when people are in their 20s.<ref name=":1" />  Between 20 and 26% of adolescents report a [[sleep onset latency]] of greater than 30 minutes. Also, 7-36% have difficulty initiating sleep.<ref name=":4">{{cite journal | vauthors = Gradisar M, Gardner G, Dohnt H | title = Recent worldwide sleep patterns and problems during adolescence: a review and meta-analysis of age, region, and sleep | journal = Sleep Medicine | volume = 12 | issue = 2 | pages = 110–118 | date = February 2011 | pmid = 21257344 | doi = 10.1016/j.sleep.2010.11.008 }}</ref>  Asian teens tend to have a higher prevalence of all of these adverse sleep outcomes—than their North American and European counterparts.<ref name=":4" />

By adulthood, parasomnias can normally be resolved due to a person's growth; however, 4% of people have recurring symptoms.