64 channel EEG data sampled at 512 Hz, acquired during overnight sleep (~22:00 to ~7:00 am). Two recording nights on consecutive days for each participant (first night as an adaptation night to the sleep lab). 2-channel EOG and bipolar chin EMG was also acquired, but not included in this dataset. Data is saved in EDF+ format, with annotations corresponding to the AASM-scored sleep stage in the following notation: 0 - wakefulness 1 – N1 2 – N2 3 – N3 4 – REM