My (25M) roommate (25M) kissed me on my forehead on his way to work this morning

I work at a restaurant currently, so my work days usually don’t start until around 3:30 pm and they don’t end until around 1 am. So usually I sleep in while my roommate starts work pretty early. We’ve never had any issues, in fact, living with him has been great. We get a long well, and both of our girlfriends have started becoming friends. Basically, it’s great, until this morning. Both of us usually keep our doors shut when we sleep, but never locked. And this morning, this cheeky bastard opens my door and walked in ever so slightly. He then, as careful as possible, kissed my forehead and said “sleep well, I’m off to work”. I was half asleep, so a lot of this is still hazy. I woke up officially around 10 am, and was honestly convinced it was a dream. Now I’m wondering if he’s done this before, because I’m a very heavy sleeper. I might have just caught him today by chance. How do I respond to this?

Edit: I appreciate all the advice I've been getting on this. I'm confused on some responses claiming this is a "joke". I would ask what that means, but I don't speak Spanish. I appreciate the English responses either way.