Using a fan at night improves sleep quality, not only for its ability to cool the air, but primarily for the consistent white noise it generates, acting as a mental trigger for relaxation.

noli's read

There is a strong consensus that the fan is an essential tool, perceived either as a 'white noise' generator or as a source of comforting air circulation. Scientifically, the use of constant sounds (white, pink, or brown noise) is supported by studies, notably a meta-analysis published in 'Sleep Medicine Reviews', suggesting that they help mask sudden noises and reduce the time needed to fall asleep. The concept of mental conditioning is also plausible, as the brain repeatedly associates these sensory stimuli with a resting state, reinforcing the bedtime ritual. However, the idea that the fan is 'proven' to be necessary for everyone is overstated, as this is an individual preference rather than a universal physiological need. Research on the direct benefits of air circulation itself, beyond thermal control, is more limited. Finally, there is no evidence to suggest that a fan is superior to any other sound source for improving sleep quality.

the sources

1. 1Lan L, Tsuzuki K, Liu YF, Lian ZW. 2017
2. 2Brown TM et al. 2022
3. 3r/sleep