People have this strange idea that people under feudalism lived in some sort of abject tyranny. Of course they didn't. Even serfs had established rights alongside their duties, and lords (whether they were knights or monks) had moral and economic reasons to maintain a balance of give and take. Social mobility was more common than we think and the elite lived far closer to the people than today. 
The Conversation
Medieval peasants enjoyed a surprising range of sick, annual and bereavement leave benefits
Some peasants were entitled to up to a year and a day of leave if they were sick.