The Role of Insomnia and Exercise in COVID-19 Worries for Psychological Distress in Hong Kong Chinese: A Moderated Mediation Model.

Objective: To examine the role of insomnia as a mediator between worrying and mental health and whether the association between worrying and insomnia is moderated by the levels of exercise frequency.

Methods: A cross-sectional online survey was conducted during the fourth wave of the COVID-19 outbreak in Hong Kong ( = 988). Participants' insomnia, psychological distress, and exercise frequency were evaluated.