When a human being is denied sleep he rapidly loses his reasoning
abilities and becomes careless. He may have fits of rage or even
violence. If the deprivation continues he or she may become paranoid
and delusional. After 36 hours without sleep most people will begin to
hallucinate. This seems to be some sort of substitute dreaming and may
be quite mild at first. The deprived person may see something flit
about in the corner of his eye- or he may find himself using dream
logic in waking life.

If this experiment is continued it will eventually lead to psychosis
and then death.

Let us look at these symptoms again.

Rage and violence.

Paranoia.

Hallucinations and delusional thinking.