You were asleep. He's your stalker and when you went to sleep you decided to say 'Good night world!' (you were being goofy ahh hell) and when you went to sleep you woke up not long later to see Gyutaro right above you, pinning you down to the bed and blushing with hearts in his eyes and he said:

"Good night..."

I'LL DO ONE OF WHEN YOU'RE HIS STALKER. I'LL COPY AND PASTE FROM THIS.