Sleep structure and sleepiness in chronic fatigue syndrome with or without coexisting fibromyalgia

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.

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