i used to have a freind who always overstated her welcome drove me nuts,so after she had done it a couple of times i came up with a plan,when i saw it was her i used to put my coat on b4 opening the door and say sorry im just on my way out,and u know it worked after doing that a couple of times she took the hint. mind u ive had company stay late and ive just said to them "your going to have to go now as im going to bed"