Do sleeper buses to Nha Trang have a toilet on board, and how often do they stop for bathroom breaks?

On buses with an onboard toilet, passengers walking to it tend to hold onto the headrest of the seat in front — this doesn't usually cause real discomfort, and you can ask people to avoid it if it bothers you.

If the bus has no toilet and there's no stop coming up soon, passengers who need one simply have to wait until the next stop.

When booking a sleeper bus, check whether it has an onboard toilet — on one trip to Nha Trang there was only a single gas-station stop during the entire journey, with no other bathroom breaks.