From: Sleep structure and sleepiness in chronic fatigue syndrome with or without coexisting fibromyalgia
 | CFS alone | CFS + FM |
---|---|---|
Number | 14 | 12 |
Age, years | 37 ± 9 | 41 ± 6 |
Body mass index, kg/m2 | 23.3 ± 5.0 | 26.7 ± 6.0 |
CES-D score | 17 ± 7 | 18 ± 10 |
Sleep structure | Â | Â |
Time in bed, minutes | 440 ± 40 | 436 ± 46 |
Total sleep time, minutes | 346 ± 60 | 358 ± 49 |
Sleep efficiency, percentage | 78 ± 10 | 82 ± 9 |
Number of arousals per hour | 6.2 ± 6.2 | 5.2 ± 3.2 |
Wakefulness, minutes | 63 ± 27 | 59 ± 39 |
Stage 1, minutes | 38 ± 20 | 27 ± 10 |
Wakefulness plus stage 1, minutes | 101 ± 28 | 86 ± 41 |
Stage 2, minutes | 203 ± 35 | 192 ± 30 |
Stage 3, minutes | 35 ± 23 | 59 ± 16 |
Stage 4, minutes | 10 ± 16 | 11 ± 15 |
Slow-wave sleep (stage 3 + 4), minutes | 45 ± 34 | 70 ± 28 |
Stage REM, minutes | 60 ± 22 | 69 ± 30 |
Sleep latency, minutes | 31 ± 27 | 20 ± 24 |
REM latency, minutes | 149 ± 77 | 101 ± 37 |
Median duration of sleep runs, minutes | 8.5 ± 5.9 | 9.5 ± 5.5 |
Likert scale (0–15.5) |  |  |
   Sleepiness |  |  |
Evening | 10 ± 5 | 8 ± 3 |
Morning | 9 ± 4 | 7 ± 3 |
   Fatigue |  |  |
Evening | 10 ± 3 | 11 ± 3 |
Morning | 9 ± 4 | 10 ± 3 |
   Pain |  |  |
Evening | 6 ± 6 | 9 ± 3 |
Morning | 6 ± 5 | 9 ± 4 |
   Feeling blue |  |  |
Evening | 1 ± 1 | 2 ± 3 |
Morning | 1 ± 3 | 1 ± 2 |