Article 1 Chronic constriction injury 1 Neuropathic pain 1 REM sleep 1 Sleep disturbance 1 Yokukansan 1 analysis of variance 1 animal experiment 1 animal model 1 chronic constriction injury controlled study 1 electroencephalogram 1 environmental factor 1 eye movement 1 frontal bone 1 hyperalgesia 1 insomnia 1 locomotion 1 male 1 mechanical hyperalgesia 1 neuropathic pain 1 nonREM sleep 1 nonhuman 1 pain threshold 1 pentobarbital 1 peripheral neuropathy 1 post hoc analysis 1 quality of life 1 rat 1 sevoflurane 1