Final answer:
Fez is in REM sleep.
Step-by-step explanation:
Fez is in REM sleep. REM sleep is characterized by brain waves that resemble those observed when a person is awake, as well as rapid eye movements. During REM sleep, the muscles are paralyzed except for those involved in circulation and respiration. This combination of high brain activity and paralysis of voluntary muscles explains why Fez's EEG resembles that of the waking state, but his muscle tone is near paralysis.