Ideally, it is advisable to avoid leaving the electric fireplace throughout the night if you are broke. That will help you to avoid high costs at the end of the month. Also, you can turn off your electric insert: 1. When using an extension cord as it can create a burning hazard 2. When a funny smell comes out of the fireplace, which may be due to electrical problems 3. If you are a wild sleeper, then consider turning it off before going to bed. That is because you may knock it unknowingly and cause more damage.