Is there anywhere that one could find that he is intelligent and insomniac? If its official (medical) definition is someone who can’t sleep, in unofficial, informal uses, this word’s meaning shades over to someone who won’t sleep.

Also, since you are trying to imply compulsive, self-destructive behavior, it’s perfect for someone whose true insomnia is brought about by their compulsion.

What does lighting cause a candle at both ends of the candle?

( Cambridge): can

work or do other things from early in the morning until late at night and thus get very little rest.