Our objective was to report the co‐occurrence of seizures during sleep and epilepsy during the menstrual period in a patient. We observed a 22‐year‐old woman with seizures during sleep; the seizures were related to menstruation. The episodes were of partial onset and secondarily generalized. She was under drug control. The patient's neurological examination and magnetic resonance imaging (MRI) were normal. Hormonal determination was within normal range for progesterone and estrogens. The polysomongraphy‐electroencephalogram (PSG‐EEG) disclosed discharges in the left fronto‐temporal area. Based on our observations, we recommend serial PSG‐EEG to identify discharges in patients with catamenial‐sleep epilepsy for a more comprehensive diagnosis.