I’m not actually sure! The only reason I found out about it was from visiting my doctor and telling him I could only ever breathe through one nostril at a time, only to find out that was perfectly normal

It’s called the nasal cycle, and basically lets half your nose rest to re-humidify, and aid in your sense of smell.

Maybe you could try Pomodoro? It splits up your time into 25 min chunks, and then you take a break and decide what to do next.

https://todoist.com/productivity-methods/pomodoro-technique