Kayla didn't think that was actually the case, even though it sounded logical. She knew people with mono. They were sicker than this. But what else could it be?

"I dunno. To be honest, I don't think that's what's up. I mean, I guess it seems logical but ... I just feel really tired and stuff. Not depressed, just ... odd."

She shrugged.

"Maybe I've just been pushing myself too hard or something."