Another problem is the dry air from the fan. Constant air movement can dry out your skin, eyes, and mouth, especially if you sleep with them open. This dryness can be irritating and make it hard to sleep well. To help, keep a glass of water by your bed and use an eye cover to protect against the drying effect.
The cool air from the fan can also dry out your sinuses, causing irritation and too much mucus. That can lead to headaches, a stuffy nose, and feeling uncomfortable. If you often have sinus issues, you might want to rethink using a fan at night or find other ways to stay cool.
Direct exposure to fan air can make your muscles stiff or cramp, especially if you like the air blowing right on you all night. This is a pain if you already have muscle problems. Adjusting the fan’s position or using a timer to limit its running time can ease this issue.