|
| Factors | Number | Items | Factor loading |
|
| First factor: sleep onset and continuity disorder | 1 | When I go to bed, it takes me a long time to fall asleep. | 0.807 |
| 2 | Overall quality of sleep (no matter how long you slept) | 0.784 |
| 3 | Awaken during my sleep time and have trouble falling asleep again | 0.762 |
| 4 | Total sleep duration | 0.756 |
| 5 | I wake up earlier than my preference time | 0.526 |
| 6 | I am aggressive and irritable in the morning | 0.405 |
|
| The second factor: disorder in daytime functioning | 7 | I wake up suddenly from sleep with an unpleasant feeling of fear, anxiety, tension, or unhappiness | 0.765 |
| 8 | I have a lot of nightmares in the sleep time | 0.713 |
| 9 | I sometimes have unusual feelings in my legs at night, such as creeping, crawling, tingling burning, or itching sensations | 0.600 |
| 10 | I wake up in the morning with feeling of fatigue and exhaustion | 0.608 |
| 11 | I have headache in the morning after waking up | 0.604 |
| 12 | I feel drowsy or sleepy during the day | 0.451 |
| 13 | I have no enough concentration in the day because of sleepiness | 0.418 |
|
| Third factor: sleep disturbance caused by environmental factors | 14 | I can not sleep because of turned on lights | 0.696 |
| 15 | I can not sleep because of environmental noise (such as cell phones, noise from medical instrument, crosstalk of nurses, and moan of other patients) | 0.690 |
| 16 | I can not get into a comfortable position in bed (by bed or pillow) which causes sleep disturbance | 0.676 |
| 17 | I can not sleep because of unpleasant ward’s odor | 0.666 |
| 18 | I wake up from sleep because of high increased or decreased temperature | 0.574 |
|
| Fourth factor: disorder caused by cardiac disease | 19 | I have cardiac problems in my sleep recently (chest pain, palpitation) | 0.714 |
| 20 | I wake up from sleep because of chest pain | 0.432 |
|
| Fifth factor: respiratory disorder during sleep | 21 | I must sleep in special position (lying down on pillow, using two pillow for elevating head) | 0.838 |
| 22 | I wake up from sleep because of snoring | 0.808 |
| 23 | I wake up from sleep because of short of breath or chocking | 0.538 |
|
