If I'm working late and a have a 5 min nap anytime after like 4pm, it makes me have insomnia that night by more than 5 mins. Happens quite consistently.
Which is why it's a poor anti anxiety thing and poor sleep aid
Not even nurses I know wear masks outside of work here.
Basically until it's visible soiled.
When wet doesn't work as well, but fine again when dries
Due to vasodilation of the eye