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Table 2 Selected sleep stage variables in chronic fatigue syndrome patients with and without coexisting fibromyalgia

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