Table 1.

Shows The Program Structure.

	iCBT-I Content
Module 1:	Introduction into the program structure and motivation for the program (statement that CBT-I is the treatment of choice for insomnia). Introduction of a sleep diary.
Module 2:	Psychoeducation: Information about sleep regulation and sleep hygiene.
Module 3:	Sleep Restriction: Stepwise reduction of time in bed (to min. 6 h) to increase sleep pressure based on the sleep diary that patients fill in since the beginning of module 1. If sleep efficiency is above 85%, participants can increase time in bed for 15 min.
Module 4:	Sleep hygiene and stimulus control: Information on sleep-inhibiting substances, sleep-wake-rhythm, evening rituals, physical exercise, etc., as well as information on the principle of stimulus control with the aim of re-associating the bed with sleep.
Module 5:	Progressive Muscle Relaxation (PMR) based on Jacobson with audio tape and written instruction to download.
Module 6:	Cognitive restructuring: Identifying, reexamining and changing dysfunctional thoughts about sleep and the consequences of insomnia.
Module 7:	Relapse prevention: what to do to prevent sleep disorders or when the sleep disturbances come back, when to seek medical help and what are the conditions of safe pharmacotherapy for insomnia.
Module 8:	Repetition and end.