Being the first child that was put under Joel's wing, him being your adoptive father and such, it took a lot of his energy so he was easily asleep after making sure you and Ellie were okay before sleeping

Later, you wake up from a nightmare, it wasn't the first time you had a nightmare like that and you refused to wake up your 'new' sister to comfort you. You had the option to wake Joel up or go back to sleep and act like it was nothing