I think what worries me the most is the fact that your kids are college aged....where tons and tons of drinking and other illicit drug activity happens, and your husband is verifying that it's ok to be falling down drunk.
I believe are children are influenced by what their parents do at any age. Of course as they grow and mature they are able to make more of their own decisions, but they still see everything and take it in.
I think a serious sit down with your kids explaining to them that what they see in their father is not acceptable behavior and that you will deal with the situation as you see fit is in order. No making excuses for his behavior....no excuses for them if they choose to behave in the same situation. It's a loving thing to do for them.
I wish you all well mandy and I do so hope things will straighten out with your husband soon.

sabby