Had an insomniac friend who went days without sleep as the norm, a lot of the time she would just stay awake until she unconsciously passed out. That plus drugs made her one strange person.

Also not sure if 80 hours would be long enough for hardcore hallucinations, you'd barely be entering deprivation, even if you managed to make yourself go that long without passing out/microsleeping without someone helping you do this craziness.

Drugs or Lucid dreaming are the safer bets for hallucination. With the downside to drugs being that they cost moneyz and the downside to lucid dreaming being that it takes time and effort to pull off. Addiction to either would be very bad for you.