Table 2

Selected sleep stage variables in chronic fatigue syndrome patients with and 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

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

Values are presented as mean ± standard deviation. CES-D, Centers for Epidemiological Study-Depression; CFS, chronic fatigue syndrome; FM, fibromyalgia; REM, rapid eye movement.

Togo et al. Arthritis Research & Therapy 2008 10:R56   doi:10.1186/ar2425

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