A study on female university students found that poor sleep efficiency and frequent daytime naps significantly increase the risk of depersonalization disorder. Sleep efficiency improvements were linked to reduced depersonalization symptoms, while more frequent naps tripled the risk. No significant association was found between sleep duration and depersonalization. These findings highlight the importance of sleep quality in mental health and suggest that addressing sleep habits could help in managing depersonalization symptoms.
https://www.sciencedirect.com/science/article/pii/S2451994420300110