The effects of 100 Hz EA stimulation and pilocarpine in sleep. Panels A &B: NREM sleep and REM sleep obtained from the undisturbed baseline, shame EA group and EA group. Panel C &D: NREM sleep and REM sleep acquired from the baseline, the pilocarpine group and the PFS + EA + pilocarpine group. Black circles: the values obtained from undisturbed rats (baseline); black triangles: the values obtained from the sham EA group; open diamonds: the values acquired from the EA group; open circles: the values obtained from the pilocarpine group; open triangles: the data acquired from the PFS + EA + pilocarpine group. *: p < 0.05 vs. baseline. Black bar: the dark period; white bar: the light period.