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Table 3 Sleep parameters of the three study nights for nightmare sufferers (NM) and healthy controls (HC)

From: Nightmares affect the experience of sleep quality but not sleep architecture: an ambulatory polysomnographic study

Variable Night 1 Night 2 Night 3
NM HC NM HC NM HC
Sleep period time (min) 453.73 ± 59.57 453.35 ± 68.57 454.70 ± 48.86 462.55 ± 72.73 430.11 ± 42.16 464.35 ± 54.12
Sleep efficiency (%) 83.51 ± 9.19 84.99 ± 7.06 90.99 ± 3.23 88.21 ± 7.08 90.28 ± 3.82 90.47 ± 4.25
Sleep onset latency (min) 18.76 ± 13.51 22.50 ± 23.87 15.26 ± 9.55 18.85 ± 16.90 16.97 ± 13.25 16.82 ± 11.46
REM latency (min) 105.47 ± 50.44 104.32 ± 48.36 78.79 ± 37.48 94.50 ± 40.95 81.47 ± 31.87 99.88 ± 43.70
REM density 20.78 ± 6.45 18.86 ± 5.44 21.06 ± 5.07 20.52 ± 5.71 21.11 ± 6.90 19.50 ± 6.41
Number of awakenings 26.94 ± 10.07 23.82 ± 8.79 24.82 ± 9.36 24.59 ± 10.89 22.41 ± 6.22 26.35 ± 9.17
Number of REM periods 3,06 ± 0,899 2,94 ± 0,966 3,82 ± 0,636 3,53 ± 1,419 3,29 ± 1,213 3,41 ± 1,004
Arousal Index 10.68 ± 3.64 8.78 ± 1.86 10.38 ± 3.35 9.09 ± 2.04 9.33 ± 2.62 9.75 ± 2.06
Awake% 11.45 ± 7.58 9.54 ± 5.33 5.67 ± 2.88 6.48 ± 5.05 5.76 ± 2.72 5.82 ± 3.59
Stage N1% 9.22 ± 3.03 8.03 ± 3.91 8.33 ± 3.92 8.20 ± 3.96 8.39 ± 3.93 9.00 ± 2.94
Stage N2% 42.74 ± 5.92 46.41 ± 6.18 45.25 ± 7.62 46.50 ± 9.01 45.01 ± 6.77 47.35 ± 7.11
Stage N3% 22.48 ± 9.24 20.77 ± 11.04 23.96 ± 9.30 20.95 ± 9.68 24.75 ± 7.87 21.57 ± 9.52
Stage REM% 13.92 ± 3.60 14.70 ± 3.85 16.75 ± 3.84 15.41 ± 4.21 16.05 ± 3.68 16.20 ± 3.70
Arousal Index (REM only) 9.85 ± 5.05 7.57 ± 3.47 9.66 ± 4.77 9.20 ± 4.43 10.37 ± 5.24 8.15 ± 4.23
Periodic leg movements 3.00 ± 6.36 1.95 ± 3.81     
Periodic leg movements with arousal 0.18 ± .59 0.23 ± .50     
  1. Results are presented as mean ± standard deviation.