Hamid is a 9-1-1 operator. When the blizzard began, he was told he would have to stay and work three extra shifts to cover for coworkers who were not able to drive to work through the storm. After 32 hours of exhausting work, he makes it home and discovers he is unable to fall asleep no matter how hard he tries. Hamid may be experiencing ________.a. electroencephalography
b. K-complex stimulation
c. lucid dreaming
d. sleep rebound