Yes, it is safe to leave your car charging overnight. There are a few things to keep in mind, however. First, make sure that you're using the correct charger for your car. Secondly, don't leave your car unattended while it's charging - this could pose a fire hazard. Finally, if you have an EV (electric vehicle), be aware that some models have a feature called 'time-of-use' charging, which means that the price you pay for electricity varies depending on when you use it. If you charge your car overnight during off-peak hours, you'll save money on your electric bill.