At least, in Sonic's case, he knew the source of the problem. In his case, he was completely in the dark, and that was beginning to become literal, the sun setting further down the horizon.

Shadow's ears flopped over. Sonic wasn't going to stay in this smaller form for much longer, was he?

"I... sincerely don't," he moaned, curling his legs inward. "This came about suddenly. I have no logical explanation for this." For once.