Dealing with summer heat is extra awful when trying to get a good night's sleep. Rather than suffering through the warmer months, use a few appliances to keep your bedroom at a cool, comfortable temperature. This includes utilizing a dehumidifier, which will not alternate room temperature but will remove humidity.
A dongle is a small piece of hardware that connects to another device to provide it with additional functionality.
For more specific troubleshooting information, please see Lenovo's documentation (here). On newer Thinkpad laptops there is a hardware switch used to enable and disable wireless networking on the laptop. Slide the switch to your right to enable wireless networking, and slide it to your left to disable it.