Ultimately, sleeping with a fan is not inherently bad, and many people can use one comfortably every night. The important thing is to pay attention to how your body responds. Persistent dryness, congestion, stiffness, irritated eyes, allergies, or unexplained morning fatigue may be reasons to experiment with your setup. A small change in fan direction, speed, timing, or bedroom conditions may be enough to preserve the cooling and relaxing benefits while helping you wake up feeling genuinely rested.
How Your Nighttime Fan Could Be Disrupting Your Sleep Without You Realizing It