He heard voices, he hallucinated and on the last day they attached electrodes to his head and monitored his brain waves. They detected REM-like phases in his wakeful brain. He was essentially insane at this point. Despite actual diagnosed psychosis, he was still able to go on with his show, which amazed pretty much everyone.
He stayed awake a total of 201 hours and slept for 24 hours afterwards. He had permanent personality changes that led to his eventual divorce. [x]
Source: Ultra Facts