Table 2. Factor Loadings for Explanatory Factor Analyses^a.

Sleep Hygiene Index	Mean	SD	Item Total	φ
Item 1 (I take daytime naps lasting two or more hours)	1.38	0.74	0.06	0.07
Item 2 (I go to bed at different times each night)	3.38	1.31	0.4	0.54
Item 3 (I get out of bed at different times from day to day)	1.94	1.27	0.35	0.48
Item 4 (I exercise to the point of sweating within 1 hour of going to bed)	1.68	1.02	0.27	0.37
Item 5 (I stay in bed longer than I should two or three times a week)	2.30	1.30	0.43	0.56
Item 6 (I use alcohol, tobacco, or caffeine within 4 hours of going to bed or after going to bed)	2.67	1.26	0.4	0.57
Item 7 (I do something that may wake me up before bedtime (for example: play video games, use the internet, or clean)	3.11	1.23	0.46	0.65
Item 8 (I go to bed feeling stressed, angry, upset, or nervous.)	3.00	1.11	0.44	0.64
Item 9 (I use my bed for things other than sleeping or sex (for example, watching television, reading, eating, or studying))	2.33	1.34	0.18	0.26
Item 10 (I sleep on an uncomfortable bed (for example: poor mattress or pillow, too much or not enough blankets))	2.55	1.39	0.32	0.45
Item 11 (I sleep in an uncomfortable bedroom (for example: too bright, too stuffy, too hot, too cold, or too noisy))	1.91	1.01	0.24	0.34
Item 12 (I do important work before bedtime (for example: pay bills, schedule, or study))	1.78	1.37	0.29	0.44
Item 13 (I think, plan, or worry when I am in bed.)	2.68	1.39	0.34	0.45

^aφ = Unrotated item factor loading of explanatory factor analyses.