I have been reading through some hotel reviews recently and I noticed that on a few of them they say people reserve sunbeds by putting towels on them the night before! I haven't personally come across this but I was wondering if you go to the pool and find all the sunbeds have towels on and you have nowhere to site, what do you do?

Or does anyone here reserve sunbeds themselves?
I think if I couldn't find a sunbed and there were loads of them with towels on I would be tempted to move them