Snape was awoken to the dulcet tones of the one he loved. Minerva McGonagall was busy screaming at Peeves as she chased the poltergeist around her bedroom.
"McGonagall and Snapey sitting in a tree, K-I-S-S-I-N-G!" Peeves bawled loud enough for the whole school to hear. Every single student turned from their breakfast towards to the staff table and blanched when they realised that the two professors were absent. Harry and Hermione simultaneously turned sideways and puked.
"Peeves. Is. NOT FUNNY!" Hermione screeched. She had partaken of a rather large dose of alcohol the previous night in an attempt to forget the horrors of catching the two professors stumble lip locked into the potions cupboard that she and Harry were making out in, and she didn't appreciate Hogwarts' resident poltergeist bringing the memory back to the forefront of her mind. Weren't poltergeists supposed to be funny?
"Minnie, get the poltergeist out," Snape snapped sleepily.
"Of course, Sevviekins," McGonagall simpered lovingly, and grabbed hold of a chair in a violent manner.
"MINNIE AND SEVVIKINS LYING IN THE BED… oh ye founders… yuck…" Peeves, after being sick, made an oath then and there to stick to funny poltergeist activities in future.