Intervention
Participants in the SH-group (After this, participants were asked to formulate three implementation intentions, by specifying how, where and when they could act to (a) prevent their obstacle from occurring, (b) overcome their obstacle in case it occurred, and (c) specify another goal-directed behavior to improve their sleep. Examples were given for each step. Finally, participants received a handout and were asked to repeat the MCII procedure on their own on the following day.