Dozy is one of the Yolkfolk.
Dozy's defining characteristic is the fact that he is always asleep, or very nearly asleep. See a Yolkfolk snoring or yawning? That'll be Dozy.
Dozy's far more interested in sleeping than.. well, anything, including helping Dizzy on his various quests. Interacting with Dozy usually requires either waking him up or helping him back to sleep - however, for those few seconds of lucidity, he can be useful!
It's unknown if Dozy can even accomplish the famous Yolkfolk somersault without falling asleep. His ability to sleep through almost anything is worth noting, however.
Dozy has appeared in many Dizzy games, including: