Do Nothing Weekends

We did nothing this weekend.  I always have big plans for the weekend.  I want to get all the chores done that I don't have the time to get to during the week.  Problem is that by the time the work week is done I am exhausted!  I feel very bad about it.  I SHOULD be going out with my boys bringing them to a place like the children's museum or even at least to the park but we didn't.  We hardly got out of our pyjamas this weekend.
It's one of the hard things about being a single mom.  I am constantly feeling like I should be doing more and then feeling guilty when I can't.  This weekend was not my proudest moment.  I get so tired that all I want to do is lounge on the couch and watch mindless tv.  I know I should be cleaning the floor or bringing the kids out but I sometimes just don't have the energy.  When the kids were younger I had nap time that I used to take as my 'do nothing' time but they no longer nap during the day at home.  I miss it!
I'm not always like this.  Some weekends I am really proud of myself for all the things I get done but sometimes the exhaustion just kicks in.  I have to say this because I have to remind myself that it's ok to have 'do nothing' weekends sometimes and that I do do a lot most of the time.  I guess it's hard because my house is never sparkling clean and I often have a basket of laundry lying somewhere waiting to be folded.  It's hard for me to say to myself - it's ok.