Shows the percent of time spent in wakefulness, NREM sleep, and REM sleep in the 24 hour period immediately post-fear-conditioning was compared to the same 24 hour period on the day prior to fear-conditioning for each group.

<p>Differences in time spent in each sleep state between pre- and post-fear conditioning were assessed by paired Student’s t-test. There were no significant differences in any of the four groups before fear conditioning compared to after fear conditioning for any sleep/wake state.