Answer:
There's a list of it.
24 hours of no sleep at all - mood swings
36 hours of no sleep at all - starts to get stressing to drive
48 hours of no sleep at all - more stress, paranoia, and auditory hallucinations
60 hours of no sleep at all - seizures or even epilepsy
72 hours of no sleep at all - visual hallucinations
96 hours of no sleep at all - both visual and auditory hallucinations
120 hours of no sleep at all - more visual and auditory hallucinations, with hypnagogic and hypnopompic hallucinations
144 hours of no sleep at all - severe symptoms or even possible heart disease
168 hours of no sleep at all - hormone damage
192 hours of no sleep at all - breathing problems from heart disease
216 hours of no sleep at all - body starts to get normal cancer
240 hours of no sleep at all - cancer starts to get not normal
264 hours of no sleep at all - your body starts to actually get severely damaged
288 hours of no sleep at all - possible leading to a coma and death
Those are the dangers.