Table 1.

Average subjective arousal ratings at each session.

			First exposure	Pre-sleep exposure	Post-sleep exposure
REM group	Neutral	Cued	2.70 ± 0.83	2.57 ± 0.86	2.39 ± 0.94
		Un-cued	2.75 ± 0.97	2.62 ± 1.16	2.54 ± 1.23
	Negative	Cued	6.02 ± 1.62	6.20 ± 1.73	5.68 ± 1.71
		Un-cued	6.20 ± 1.53	6.09 ± 1.64	5.86 ± 1.68
SWS group	Neutral	Cued	2.38 ± 1.01	2.27 ± 0.79	2.10 ± 0.64
		Un-cued	2.33 ± 0.81	2.22 ± 0.72	2.10 ± 0.64
	Negative	Cued	5.62 ± 1.64	5.40 ± 1.54	5.34 ± 1.58
		Un-cued	5.52 ± 1.57	5.47 ± 1.59	5.45 ± 1.66

Average ratings for neutral and negative, Un-cued and Cued stimuli at each of the three arousal rating sessions. These sessions occurred at the very start of the experiment, prior to 2-back task and half an hour after sleep, respectively. Average ratings are shown ± standard deviation. REM rapid-eye movement sleep, SWS slow-wave sleep. REM group, N = 15, SWS group, N = 18.