Draco Malfoy was in the dungeons, but not just any dungeon. He was in the Hogwarts dungeons. And where exactly was he?
He was in Severus Snape's bedroom.
And guess what? Professor Severus Snape was asleep on his comfy four-poster bed, soundlessly sleeping and dreaming of fluffy bunnies or something ridiculously out of character and the like.
Now, you may ask, what exactly was Draco Malfoy doing in a teacher's bedroom in the middle of the night, sneaking like a thief? Well, the answer to that is…
"WAKE UP CALL, PROFESSOR! THIS IS YOUR WAKE UP CALL!" he screached in a high-pitched wail, pulling out from under his belt a large red horn.
Draco Malfoy was not seen for several days afterwards.