Motivation to clean?!

I am going to be a stay-at-home-mom once my little guy is born in a month or so and I am already having trouble motivating myself to do housework!  Maybe cause I am so tired lately and don't have energy enough to do anything but sit on the couch, but I'm worried now that I won't be able to motivate myself after he arrives either!  I don't like sitting around a messy house, but how do you all do it?  I have thought about assigning certain tasks to certain days, but have not actually done it yet.  I also get motivated in the morning to cook dinner and then by the time my husband gets home and it is time to eat I don't feel like making what I had planned!

Let's hear your tips on staying motivated and keeping up with everything around the house.  I need to get in the habit of doing it.....and soon!!

This is what I feel like doing all day!