Table 1.

Rapid eye movement (REM) sleep episode numbers and duration in non-sleep deprived (NSD), stress control (SC) and sleep-deprived (SD) mice on the baseline, training and testing days of contextual fear conditioning.

Group	Baseline	Training	Testing
A REM sleep frequency (Mean ± SEM)
NSD	18.6 ± 2.99	13.6 ± 1.36*	15.5 ± 2.53
SC	21.8 ± 3.21	15.8 ± 3.18*	15.6 ± 2.20*
SD	23.0 ± 3.65	0	29.80 ± 4.73
B REM sleep frequency (Mean ± SEM)
NSD	1.19 ± 0.22	0.97 ± 0.08	0.96 ± 0.11
SC	1.11 ± 0.14	1.01 ± 0.10	1.09 ± 0.11
SD	1.0 ± 0.16	0	0.82 ± 0.08

*signifies p < 0.05: significant decrease compared to the baseline.