I don't close unless I am really sick (fever, stomach bug), but if I am that sick, I know I cannot care for the kids and I would be risking passing it on to them all as well. Then I let parents know the night before if possible and I don't feel guilty because I am human. Parents take sick days...we need to as well. Although it is a pain for parents, they CAN make arrangements...somet hing always works out...I have even had some parents thank me for the day off at home with their child I think as long as it is not too frequent, parents are going to be quite understanding and if they are not, that is their problem.