Can a person get to much sleep? And how many hours is to much?

Could be. There are some studies which suggest too much sleep can be associated with diabetes, hypertension, increased weight, and other medical problems. People vary, but its rather unusual to need more than 9 hours sleep. A good discussion from the natl sleep foundation can be read here: http://www.Sleepfoundation.Org/article/how-sleep-works/how-much-sleep-do-we-really-need.