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Link to original content: https://pubmed.ncbi.nlm.nih.gov/23786736
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. 2013 Jul;40(4):536-9.
doi: 10.1017/s0317167100014621.

Sleep-laughing--hypnogely

Nikola N Trajanovic  1 , Colin M Shapiro, Srdjan Milovanovic
Affiliations

Sleep-laughing--hypnogely

Nikola N Trajanovic et al. Can J Neurol Sci. 2013 Jul.

Abstract

Objective: To explain relatively common phenomenon of laughing during sleep and help to better define criteria for differentiating between physiological and pathological sleep-laughing.

Methods: Observational study of patients who underwent a sleep assessment in a referential tertiary health facility.

Results: A total of ten patients exhibited sleep laughing, nine of whom had episodes associated with rapid eye movement (REM) sleep. Also, in one of the patients sleep-laughing was one of the symptoms of REM sleep Behaviour Disorder, and in another patient sleep-laughing was associated with NREM sleep arousal parasomnia.

Conclusion: The collected data and review of literature suggests that hypnogely in majority of the cases presents as a benign physiological phenomenon related to dreaming and REM sleep. Typically, these dreams are odd, bizarre or even unfunny for a person when awake. Nevertheless, they bring a sense of mirth and a genuine behavioural response. In a minority of cases, sleep-laughing appears to be a symptom of neurological disorders affecting the central nervous system. In these patients the behavioural substrate differs when compared to physiological laughing, and the sense of mirth is usually absent.

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