Keep in mind the needs and capabilities of your vessel while sailing at night. It is likely that you will use more power than you are making. Running your navigation lights, autopilot, radar, refrigeration, heat, air conditioning, water pumps, and other electronics will suck your batteries dry if you are not careful. Unless you have a wind turbine, running a generator may be the only option to keeping your battery bank from getting dangerously low. If you have to run a generator, be considerate again of your crew mates and try to run it while you are both awake or for an equal portion over two shifts. Be mindful of how much power your vessel draws and try to reduce your consumption as much as possible by using headlamps or flashlights instead of overhead lighting and hand steering for the first hour or two of your shift. Stock up on unrefrigerated snacks and beverages so you can eliminate opening and running the refrigeration systems. A significant amount of power can also be used if your vessel is set up with electric winches and roller furling systems. If possible, use the opportunity to practice trimming sails by hand. Your boat and your crewmates below will thank you for conserving power and keeping noise to a minimum.