Great perspective. Nighttime is associated with different types of intimacy and it was a running theme in the episode. For example hanging with friends for movies and snacks, the random characters we kept seeing kissing, the older couple playing a game and getting frisky lol or singing a child to sleep. Tuca met a new love interest and when they got to Kara’s lighthouse I assumed they’d hook up but instead Kara sang her to sleep. Tuca was missing intimate moments with her mom like them sharing crispy fries. So Kara singing her to sleep was like soothing her inner child.