Table 2

General description of the sleep problem [SOS part 1 (overview) & 2 (sleep habits)]
General sleep problem Frequency Percentage
Having an actual problem with sleep or wakefulness 179 69.1
Main sleep problem
Difficulty falling asleep 83 32.1
Difficulty staying asleep 128 49.4
Awakening early and being unable to fall back asleep 76 29.3
Excessive long sleep at night 21 8.1
Unusual behavior or experiences during sleep (e.g., nightmares, sleepwalking) 30 11.6
Excessive sleepiness during waking hours 66 25.5
Other problems 34 13.1
Judgment of the sleep problem
Intense severity of the sleep problem (or problems) 67 26.9
Intense amount of interference with ability to function at home, at work, and with other people 48 19.3
Fairly intense sleepiness before bedtime 127 51.0
Better sleep outside compared to the sleep at home 11 4.4
Having regular sleep times 192 74.1
Times related to sleep Mean Std
Bedtime during the week 22.6 0.9
Bedtime at weekends 23.2 1.3
Time of lights off during the week 22.9 1.1
Sleep latency 28.1 19.3
Frequencies of sleep interruptions 2.8 1.8
Sleep latency after interruptions 21.9 16.4
Wakeup time during the week 6.5 1.2
Sleep duration 6.4 1.5
Get up time during the week 6.9 1.1
Get up time at weekends 8.0 1.1
Frequency Percentage
How long having sleep problem
Between 6 months and 2 years 74 29.7
Between 2 and 5 years 60 24.1
>5 years 93 37.3
Course of the problem
Becoming worse 15 6.0
Same 112 45.0
Improving 17 6.8
Irregular 79 31.7
Recurring regularly 8 3.2
Frequency
Every day/night 109 43.8
Sometimes in a week 24 9.6
Sometimes in a month 31 12.4

Burkhalter et al.

Burkhalter et al. BMC Nephrology 2013 14:220   doi:10.1186/1471-2369-14-220

Open Data