Optimal fan placement for better sleep during heat

Using a fan during sleep can assist in heat dissipation by moving air and facilitating sweat evaporation, though it does not lower the actual air temperature. Research from the University of California, Berkeley, indicates that excessive heat can disrupt sleep cycles, including REM sleep, by causing more frequent awakenings.

To optimize comfort and health, experts suggest avoiding placing fans directly in front of the face, as this can dry out the eyes and throat. Instead, effective placements include:

• Positioning the fan at a 45-degree angle from a corner of the room, approximately 1.5 to 2.5 meters from the bed. • Placing the fan at the foot of the bed to target the legs and feet. • Orienting the fan toward an open window to help exhaust warm air from the room.

If a room has both a window and a door open, the fan should be used to create an air path that pushes warm air out. For single-window rooms, placing the fan near the opening can help circulate cooler outdoor air when available.