unless i managed to miss it... i think this is a headcanon! especially think so because even at their parents' houses, i believe they had their own separate rooms.

it has been established though that they're not used to living apart, and would have to get used to not greeting each other when they'd get back. hinata in particular felt especially lonely over it because he struggles being apart from yuuta.

i always got the impression yuuta adjusted very well, since he really loved how it all was a new change of pace, and would freely go home on his own since he and hinata lived apart now and had different schedules. i don't think any of his phobias are triggered sleeping apart from hinata either.