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Table 4 Sleep parameters of nights with nightmares in frequent nightmare sufferers (NM) compared with matched nights of healthy controls (HC)

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

Variable NM HC NM vs. HC Effect size
n = 11 n = 11 t p d
Sleep period time (min) 444.63 ± 58.20 461.36 ± 61.98 −0.652 0.522 0.28
Sleep efficiency (%) 84.73 ± 9.65 85.65 ± 6.64 −0.262 0.796 0.11
Sleep onset latency (min) 20.77 ± 13.55 15.364 ± 10.02 1.064 0.300 0.45
REM latency (min) 86.54 ± 42.78 95.04 ± 39.64 −0.483 0.634 0.21
REM density 21.68 ± 8.10 22.80 ± 7.00 −0.348 0.731 0.15
Number of awakenings 28.36 ± 11.38 28.73 ± 8.90 −0.083 0.467* 0.04
Number of REM periods 3.45 ± 1.29 3.27 ± 0.64 0.417 0.683 0.18
Arousal Index 10.63 ± 3.19 9.46 ± 1.21 1.130 0.140* 0.48
Awake% 11.02 ± 9.06 10.95 ± 6.07 0.022 0.983 0.01
Stage N1% 10.14 ± 3.19 8.24 ± 3.36 1.353 0.191 0.58
Stage N2% 44.89 ± 6.61 44.23 ± 7.02 0.227 0.823 0.10
Stage N3% 19.83 ± 6.86 21.22 ± 8.51 −0.423 0.677 0.18
Stage REM% 14.08 ± 3.85 15.32 ± 3.53 −0.786 0.441 0.34
Arousal index (REM only) 10.73 ± 5.15 12.09 ± 8.38 0.519 0.305* 0.22
Periodic leg movements 1.78 ± 5.91 1.18 ± 3.94 0.278 0.784 0.12
  1. Results are presented as mean ± standard deviation.
  2. *One-tailed t-test.