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Appendix 1. The Basic Nordic Sleep Questionnaire (BNSQ): 46 Questions concerning insomnia and sleepiness.
Insomnia:
1.
How often have you had difficulties falling asleep during the past three months?
1.
Never or less than once per month
2.
Less than once per week
3.
On 1-2 evenings (nights) per week
4.
On 3-5 evenings (nights) per week
5.
Every evening (night) or almost every evening (night)
2. How often have you woken up during the night during the past three months?
1.
Never or less than once per month
2.
Less than once per week
3.
On 1-2 nights per week
4.
On 3-5 nights per week
5.
Every night or almost every night
3.
If you usually wake up during the night, how many times did you wake up in the course of the night during the past three months?
1.
Usually I do not wake up at night
2.
Once per night
3.
2 times per night
4.
3-4 times per night
5.
At least 5 times per night
4.
How often have you woken up too early in the morning and not been able to fall asleep again during the past three months?
1.
Never or less than once per month
2.
Less than once per week
3.
On 1-2 nights per week
4.
On 3-5 nights per week
5.
Every morning or almost every morning
5.
How have you slept during the past three months?
1.
Well
2.
Quite well
3.
Not well but not badly either
4.
Quite badly
5.
Badly
Sleepiness:
1. Have you felt disturbingly tired in the mornings during the past three months?
1.
Never or less than once per month
2.
Less than once per week
3.
On 1-2 nights per week
4.
On 3-5 nights per week
5.
Every morning or almost every morning

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2.
Did you feel disturbingly tired during the daytime during the past three months?
1.
Never or less than once per month
2.
Less than once a week
3.
On 1-2 days per week
4.
On 3-5 days per week
5.
Daily or almost daily
3.
Have you suffered from compulsive falling asleep at work during the past three months?
1.
Never or less than once per month
2.
Less than once per week
3.
On 1-2 days per week
4.
On 3-5 days per week
5.
Daily or almost daily
4.
Have you suffered from compulsive falling asleep during your leisure time during the past three months?
1.
Never or less than once per month
2.
Less than once per week
3.
On 1-2 days per week
4.
On 3-5 days per week
5.
Daily or almost daily
5.
How often do you take a nap during the daytime?
1.
Never or less than once per month
2.
Less than once per week
3.
On 1-2 days per week
4.
On 3-5 days per week
5.
Daily or almost daily