Catatonic patients will sometimes hold rigid poses for hours and will ignore any external stimuli.
Patients with catatonic excitement can die of exhaustion if not treated.

http://en.wikipedia.org/wiki/Catatonia


Oneirophrenia: a hallucinatory, dream-like form of catatonia caused by conditions such as
sleep deprivation, sensory hyperstimulation, or prolonged drug use


http://en.wikipedia.org/wiki/Oneirophrenia