Table 1.

Exploratory factor analysis of loadings of the Jenkins Sleep Scale items

Jenkins Sleep Scale items	Factor #1	Uniqueness
Trouble falling asleep	0.62	0.61
Waking up but no trouble falling asleep again	0.72	0.48
Waking up and trouble falling asleep again	0.79	0.37
Waking up feeling tired	0.63	0.60