You are not alone. There have been many times that paper plates and plastic silverware sound like a good idea.
I work part-time at an Elementary School and attend online college. I have two children still at home..17, and 3. My 3 yr. old helps out more around the house...lol.
I still have dishes in the sink from Friday and laundry pushed to the foot of my bed because I did not feel like putting it away last night. I have a pile of mail on my kitchen table that needs my attention..eventually.
I feel like I am doing everything for everyone else and when it comes to "me" time, I am too exhausted. Some days I don't have time for my children because I have paperwork and schoolwork to get done. I thank God that I will be done working in 2 weeks. That will free up a lot of my time.
The whole thing is based on poor scheduling and putting other things first that should be last. I try to make a daily schedule to follow and on my days off during the week, I try to get in 2 hours of "quiet time" for myself. It ends up being spent doing homework or cleaning so by the time I get everything done and want to watch TV, my youngest is up from her nap and wants my undivided attention.
I know what you mean about Saturdays. I spent the majority of Saturday writing two papers for school. Yesterday after church/lunch, I spent the afternoon driving to my office to turn in my weekly paperwork. We didn't get home until 4:30. It seems like I wasted the whole day.
As far as cleaning goes, I clean before I go to bed. I hate waking up to a messy house. We also clean up before "nap time" too.
I even get up at 5am so I can have time alone to check my emails and whatever else I can get accomplished before the kids get up. Speaking of which, I have to get them up and get ready for work.
Just know you are no alone.