This dataset contains data from an overnight EEG-fMRI study, performed in the Advanced MRI section, LFMI, NINDS, National Institutes of Health, in approximately 2016-2017. This study is called 'sleep1', and is the pilot study for 'sleep2', which ran from 2019-2024. Subjects were scanned for two consecutive nights for approximately 8 hours using EEG/fMRI, and were arroused at random intervals 8 times during the night.