Objective To explore the relationship between sleep misperception and sleep structure in epileptic patients. Methods A total of 102 epileptic patients were recruited in the research. The difference of sleep structure were compared among the group of overestimation， relative accurate estimation and underestimation. Results Sleep misperception occurred in 78% of patients with epilepsy， further， 35% of which were from the underestimation group and 43% from the overestimation group. The rate of generalized tonic-clonic seizures（ GTCS） incidence in the group of under estimation was significantly higher than that in the relative accurate estimation group. Arousal index（ ARI） of sleep stages of Non-rapid eye movement 1（ N1） and N2 tended to increase in turn of overestimation， relative accurate estimation and underestimation group. The ARI of N3 in over estimation group was higher than that in the relative accurate estimation group. Conclusions Sleep misperception occurs in most of epilepsy patients， and patients with GTCS tend to underestimate the sleep duration. Sleep misperception is related to sleep instability enhancement. In addition， sleep underestimation is related to the instability enhancement of N1 and N2 stages of sleep， and sleep over estimation is related to instability enhancement of N3 stages of sleep.