Table 2.

Promax rotated matrix of the Lebanese Insomnia Scale items

Factor	Items	Factor 1	Factor 2	Factor 3	Factor 4	Factor 5
I am afraid to go to bed because of my disturbed sleep	RIS 8	.820
I think a lot about my sleep	RIS 7	.744
I feel that I have not slept all night	RIS 6	.721
I wake up from the slightest sound	RIS 5	.657
Awaken short of breath or with a headache?	MOS-SS 5	.640
Sleep induction	AIS 2		.846
Awakenings during the night	AIS 1		.778
How long did it usually take for you to fall asleep during the past 4 weeks?	MOS-SS 1		.659
Final awakening earlier than desired	AIS 3		.606
Total sleep duration	AIS 4		.563
During the past month, how often have you had trouble sleeping because you feel too hot	PSQI 5 (g)			.794
During the past month, how often have you hadtrouble sleeping because you feel too cold	PSQI 5 (f)			.772
During the past month, how often have you had trouble sleeping because you have pain	PSQI 5 (i)			.742
Take naps (5 min or longer) during the day?	MOS-SS 11				.788
Snore during your sleep?	MOS-SS 10				.611
Functioning (physical and mental) during the day	AIS 8				.479
On the average, how many hours did you sleep each night during the past 4 weeks?	MOS-SS 2					.739
Get enough sleep to feel rested upon waking in the morning?	MOS-SS 4					.698
Cronbach alpha		0.788	0.754	0.718	0.794	0.694
Percentage of variances explained		28.80	10.30	7.72	6.86	5.95

Component 1: Sleep thoughts, feelings, physical sensation and behaviors; Component 2: sleep quality and patterns; Component 3: factors related to sleep disturbances; Component 4: daytime sleepiness and impact on daily functioning; Component: quantity of sleep

Cronbach alpha for the LIS-18 scale = 0.821

AIS Athens Insomnia Scale, PSQI Pittsburgh Sleep Quality Index, RIS Regensburg Insomnia Scale, MOS-SS Medical Outcomes Study Sleep Scale