Research Article

A Preliminary Evaluation of the Physiological Mechanisms of Action for Sleep Restriction Therapy

Table 3

Descriptive information of participants and treatment course.

ISISleep window Respect to time off bed (min) Respect to arising time (min)
AgeInsomnia durationSleep stabilisation
(days)
Actigraph
M (SD)
Sleep diary
M (SD)
Actigraph
M (SD)
Sleep diary
M (SD)
BPost Fu3Duration of the 1stModification
(Years)

P1221711676:30Weekly ↑ by 15 min616.4 (16.7)18.3 (34.5)−8.9 (17.7)0.9 (28.4)
P23661810105:00Weekly ↑ by 15 min until week 694.4 (11.4)−0.6 (14.1)7.7 (11.1)13.6 (15.7)
P3625171386:40↑ by 15 min at weeks 3, 5, and 61624.1 (24.2)−1.6 (2.7)23.8 (19.8)13.4 (11.8)
P4361515006:00↑ by 15 min at weeks 3 and 4n/a −21.2 (0.0)−9.5 (19.2)72.2 (0.0)5.38 (18.6)
P5532011676:15Weekly by 15 min for 3 weeks; then ↑ by 15 min25−1.98 (17.9)13.5 (11.8)46.0 (25.0)29.0 (15.8)

ISI: Insomnia Severity Index; B: baseline; Post: posttreatment; Fu3: 3-month follow-up; ↑: increase; : decrease; min: minute; Respect to time off bed: a score of “0” means a perfect respect of the time off bed. A positive score means going to bed later than the prescribed time while a negative score means going to bed earlier; Respect to arising time: a score of “0” means a perfect respect of the prescribed time to get out bed in the morning. A positive score means getting out of bed later than prescribed time in the morning while a negative score means getting out of bed earlier than prescribed.