Do bats poop while sleeping

All living organisms excrete waste, so yes they do. In fact whilst bat urine is not a problem, bat faeces (bat poo) is. In the UK all bats are a protected species and so if bats are present in a builting (like in the loft of your home) you are nor allowed, by law, to remove them unless this is done by a specialist and the bats properly rehoused. In the meantime their droppings and can become quite a nuisance and health hazard.