A total of 127 hospitalized suicide attempters were interviewed within 2 weeks post-attempt.
The suicide attempters were retrospectively assessed for insomnia and mean sleep time for 2 weeks pre-attempt.
Insomnia, short sleep, and insomnia with short sleep predicted suicidal intent.
Insomnia and short sleep partially mediated various predictors' effect on intent.
Improving sleep in suicidal subjects may reduce the lethality of suicidal acts.