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.
But as the term 'dongle' became more widespread its meaning changed from strictly a scientific term to mainstream. The current meaning for dongle seems to be something like a self-contained device that plugs into a port on a computer that is normally used for connections to a separate external device.