OFF periods occur mainly during SWS. A, Hypnogram and dynamics (occurrence and duration) of OFF periods during the different vigilance states. B, LFP in the RSC and simultaneously recorded unit activities in the RSC during SWS showing an example of an OFF period with the corresponding delta wave (shaded area). C, Averaged LFP in the RSC signal, locked to the onset of the OFF period (dashed line) sorted by the duration of the OFF period during SWS. D, Incidence and (E) average duration of OFF periods according to the behavioral state (n = 6 rats). *p < 0.05, paired t test.