These are ECoG data from a monkey who was sitting still with its hard and arms restrained and was then anesthetized so as to lose consciousness.
One monkey was sitting calm with its head and arms restrained. ECoG data were recorded first in an alert condition, then anesthesia was injected, and the anesthetized condition began.
128-channel ECoG data were sampled at 1KHz.
Data are originally from http://neurotycho.org/sleep-task.