This is ECoG data from Yanagawa, T., Chao, Z. C., Hasegawa, N., & Fujii, N. (2013). "Large-Scale Information Flow in Conscious and Unconscious States: an ECoG Study in Monkeys." PloS one, 8(11), e80845.
One monkey was sitting calm with head and arm restrained. ECoG data were recoreded during awake (eyes-opened, eyes-closed), anesthetic and sleeping conditions.
128-channel ECoG data were sampled at 1KHz.
Data are originally from http://neurotycho.org/anesthesia-and-sleep-task.