ELI5, why is it that we only breath through one nostril? Also, why does it feel like it’s more evident when laying on bed, about to sleep?

Question

ELI5, why is it that we only breath through one nostril? Also, why does it feel like it’s more evident when laying on bed, about to sleep?

In: 10

Answer 1

[The nasal cycle](https://en.wikipedia.org/wiki/Nasal_cycle?wprov=sfti1) has a lot of benefits, but primarily the alternation prevents over drying — which assists in humidification of the lungs and preserves olfactory senses.

Absent a cycle, both nostrils would tend to dry out and lead to more pervasive health issues.