Narissa was often one of those people - she had recently even gone for 3 am pancakes - so she knew what places had later hours. It was nice enough to be able to wander and see the different people that were out at night versus during the daytime. She loved people, so it was just another thing she paid attention to.
When he asked what he owed her she frowned faintly. "It's a gift. You don't owe me anything." She liked making people smile. It made her happy to see enjoyment and have people like her.