No, not the song by that one guy that left One Direction.
I'm talking about how if you ever sleep next to Hajime, you will take notice how he would mumble stuff in his sleep,especially into his pillow. Oikawa took advantage of this once and had a full blown conversation with him, whispering naughty things into his ear to see what he'd reply. Let's just say, Oikawa had a little too much fun with this and had a little issue in the downstairs region.