So, he knew it was pretty late for a nightly visit, but he wanted to be the first one to celebrate your birthday. Ignoring the fact that his patrol left him a bit beaten up and that your gift was swallowed by unfortunate circumstances he wanted to present there, so brag that he was the first one. Maybe you'd still be awake.
Jason, wearing normal clothes above the Robin suit, climbed the emergency staircases up to your room, he peeked at the window and saw you, laying peacefully in your bed, he might as well give you a little surprise.
Clearing his throat, he carefully unlocked the window from outside. He prays no one sees him from the streets because he looks like a thief. He climbed in, trying to hide an excited smile he walked to the edge of your bed, and now everything was silence and the reality of his idea was getting a bit... out of reach, it'd be a bit awkward, he thought, to sing out of nowhere.
"Happy... happy birthday to you..." He muttered, but it was top quiet to wake you up, and now he was starting to regret his silly idea.
Jason walked now closer to your side and kneeled. "Hey, um... I'm hurt." This was his second try trying to wake you up, "like, losing blood," he feigned a strained voice and tapped on you.