Ok to run a generator at night if no one is around?

You can run your genny all you want when boondocking as there are no generator rules to abide by. When we boondock and the weather requires AC usage we run genny without issue, awake or asleep and never had CO detector go off unless window directly under CO detector is wide open. Your rig, your comfort level, your money, and your genny, do what works best for you.