Anyone else out there having trouble dealing with their children this Summer Vacation?

I find it very difficult to stay upbeat since my kids (twin 8 yr. olds and a 5 yr. old) have been home all day, EVERY day. My days are spent following them around, cleaning up their messes and playing Referee to their MANY fights. They've figured out that since there's no school for a while, they can stay up late. They are up as late as I am, and still wake up before they did during the school year!(?) I have become like a grouchy bear in the mornings, never ready to spring from my bed to meet their list of demands they have waiting for me. I feel like they're draining me dry. My husband made some really nasty comments to me last night about how hard it is for me to get up in the mornings, and a good mom would do it without complaint, because "that's what I signed up for" when I became a Mom. He puts in his 40 hrs at work and he's done, all the while I feel like Cinderella in her "Before" picture... Does anyone relate? am I crazy?