insomniac• It allows an insomniac who can not get exposure to sunlight to still benefit from the regulating effects of ultraviolet rays.• He was a light sleeper, for long periods an insomniac.• It's like screening shows for insomniacs at lunchtime.• This is especially-true for insomniacs, who seem to have a lower tolerance to the stimulating effects of caffeine than most people.• This alternative drug has received an open-armed welcome from insomniacs around the world.• Some insomniacs sleep best with two twin mattresses placed atop a king-size frame.• I was a terrible insomniac when I was a teenager, but never on account of cockroaches.• The insomniac Proust wilfully obliged others to accommodate themselves to the bizarre hours he kept.