Keep lubricating drops handy AND stored so that the container is protected so the grit that gets in your pockets won't work it's way in to the dropper tip which sucks. Like anything else, try it out at home first. I don't like sleeping in them, but can do it when needed.
Also, the spare pair is sound advice.
"My message to my troops is if you see anybody carrying a gun on the streets of Milwaukee, we'll put them on the ground, take the gun away and then decide whether you have a right to carry it." - Milwaukee Police Chief Ed Flynn
Like anything else, try it out at home first. I don't like sleeping in them, but can do it when needed.