Hopefully you’re not an insomniac and/or hypochondriac. It’s called fatal familial insomnia, or FFI, and is a very very rare brain disease. It’s caused usually by a mutation to the PrPC protein, but can also happen spontaneously.
It begins with progressively worsening insomnia, followed by hallucinations, delirium, and then dementia. Once the symptoms begin, the average lifespan is anywhere between 7 and 18 months. Most often it’s genetic, and is so rare that it’s been found in just 40 families and about 100 people total since its discovery in 1765.
While one might think sleeping pills would help, but they’ve been proven to actually worsen the situation. Even an induced coma doesn’t work; it was attempted on a man in 1991 and his brain just wouldn’t shut down. In that case, when the man died, he hadn’t slept in 6 months.