Editing Insomnia (section)

=== Subjectivity ===
{{Main|Sleep state misperception}}
Some cases of insomnia are not insomnia in the traditional sense because people experiencing [[sleep state misperception]] often sleep for a normal amount of time.<ref name="Harvey_2012" /> The problem is that, despite sleeping for multiple hours each night and typically not experiencing significant daytime sleepiness or other symptoms of sleep loss, they do not feel like they have slept very much, if at all.<ref name="Harvey_2012" /> Because their perception of their sleep is incomplete, they incorrectly believe it takes them an abnormally long [[Sleep onset latency|time to fall asleep]], and they underestimate how long they stay asleep.<ref name="Harvey_2012">{{cite journal | vauthors = Harvey AG, Tang NK | title = (Mis)perception of sleep in insomnia: a puzzle and a resolution | journal = Psychological Bulletin | volume = 138 | issue = 1 | pages = 77–101 | date = January 2012 | pmid = 21967449 | pmc = 3277880 | doi = 10.1037/a0025730 }}</ref>