✄ for a drunken headcanon
Yori's a 'sad drunk', and one of the ones who'll spill all his secret worries to whoever happens to be next to him, whether they're listening or not... And if they do listen and acknowledge him, he might try to kiss them. He's the one member of the band who the others always make sure to keep as sober as possible, because he's pretty embarrassing.
☾ for a sleeping headcanon
He has nightmares every night, no exceptions, and normally wakes up in a bit of a bad state. For this reason, he will make sure not to fall asleep in front of anybody, and keeps caffeine tablets in his pocket for emergencies.