Many quests are actually linked to other quests, even if it doesn't say it anywhere. If it doesn't trigger simply from sleeping in your room a few times (I'm assuming you're at one of the "wait a few days" parts), just advance other quests until it unlocks, giving special attention to the Sharp Fangs one, since there are interactions with both Julia and Emma, so that might be part of the required trigger.
I've never bothered actually looking too deep into the quest requirements and putting them on the list because of this. Mostly it's just advancing other stuff until it unlocks.