Paris shuts down earlier than expected but some stuff stays open for night owls like me who refuse to plan ahead around République

Monoprix champs élysées until midnight for groceries. Franprix stores around république and marais stay open till 10-11pm. Some pharmacies with green crosses stay open 24 hours (google "pharmacie de garde paris") around châtelet

Restaurants in chinatown (13th arrondissement) serve food way later than touristy areas around louvre. Kebab shops obviously but also proper chinese places until midnight or later around place d'italie. Much better than hotel room service prices in saint-germain