Insomniac Knuckles is part of the Insomniac collection.
Knuckles has trouble sleeping one night, and Charmy tries to help him, but rather seems to make things worse.
Charmy: [finishing up the story] Good night, Knuckles! Knuckles? Where are you? [he finds him under the bed, shaking]
There you are... Aren't you asleep yet?
Knuckles: [His fist comes out from under the bed and punches Charmy]