Yes, you can charge your Arizer Air 2 overnight, but there are a few things to consider before you do. First, ensure you use the original charger with your Arizer Air 2. Using a different charger, especially one not designed for your vaporizer, can be dangerous and potentially damage your battery. Assuming that you're using the original charger, the next thing to consider is where you're charging your Arizer Air 2. You must ensure you're setting it in a safe and well-ventilated area. Avoid charging it on soft surfaces like your bed or couch, as this can block the airflow and cause your vaporizer to overheat. Watching your Arizer Air 2 while charging overnight is also a good idea. While it's unlikely, there's always a small risk of something going wrong, like a short circuit or an overheated battery. By watching it, you can quickly address any issues that may arise. Finally, charging your Arizer Air 2 overnight is optional for most users. The battery typically only takes a few hours, so you can quickly charge it during the day and have it ready to go by the time you're ready to vape. If you decide to charge your Arizer Air 2 overnight, take the proper precautions to ensure it's charging safely.