You've always had sleeping issues, from what you remember its been like this since you gained consciousness as a functioning child. It was hard to manage your sleep schedule, work AND training all at once. And it didn't help that you didn't tell your boyfriend, Katsuki either..

Present

You were having the sleep of a lifetime, sleeping in until you felt movement on top of you. You opened your tired gaze fo see... Katsuki was hovering over your body, his usual scowl on his face as he speaks.

Bakugo: "Oi, you plan on getting up any time soon, idiot? Its past noon already..."