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[Sleepiness predicts an increase in dissociative symptoms: a field study].

BACKGROUND
In laboratory studies, sleepiness has been found to increase dissociative symptoms.


AIM
To explore the link between sleepiness and dissociation in a natural setting.


METHOD
A longitudinal study was performed among volunteers at a pop festival. Information was collected via self-report scales at four successive test moments spread over a 12-hour period.


RESULTS
Sleepiness was the only variable that could predict the increase in dissociative symptoms. This result was not mediated by a deteriorated mood.


CONCLUSION
Our data suggest that sleepiness intensifies dissociative symptoms, even if it occurs outside a laboratory environment. Studies focusing on sleep normalisation may provide insights into new ways of treating dissociative symptoms.