She got a strong craving for Bahn chuoi after working all day, but the restaurant she usually gets it from is closed. She has to make something like it to satisfy the craving before she can sleep.
Rio is at the brink of making an intellectual breakthrough after working tirelessly and researching books cover to cover. They don't want to risk going to bed and losing the momentum.
His fire is burning too hot and bright and he needs to get it under control before if destroys his food and clothing. He doesn't have a lot of clothes, so he wants what he does have to not be ashes when he wakes up.