I Should Have This Figured Out

So, my hubby and I have been married for over 11 years, we have an 11, 9, and two 7 year olds. I have been a stay at home mom full time for the last 7 years, and off and on for about two years before that. I really enjoy being home. I have not always enjoyed the house work, but in more recent years have grown to embrace and even enjoy being a home maker, and all that it entails. So here is the problem. Why can't I keep up with it all the time. Why is it that one week I keep up with it all like I'm Martha Stewart, and the next week it's like I've been thrown into an alternative universe and I don't know how it operates. I get behind in the laundry, I just can't quite get the kitchen really pulled together. And I just sit on the couch and wonder what to do with it all. Eh. Oh well. Surely I'm not the only one. Surely there are other moms who have their acts together one day and are train wrecks the next. I'm just gonna keep telling myself that.