Oh, I've been there! Recently.
My mindset was - I'm going to take a shower and then I'll get all sweaty and gross if I put any effort out at all. It was the detox making me sweat, of course.
So here's my suggestion: start with changing your bed linens. Then do something else, just one other thing. I like sugarbear's suggestion of tasks in the fishbowl, but make them small things. Put some music on and do one thing (throw the one thing back in and pick another if you don't feel like doing it!
). If you feel like it, do another. Etc. Once you are done, take a shower and put on clean jammies. Watch Netflix or read or do a puzzle or read SR until it's time for bed.
In my book, there is no feeling better than going to bed and waking up clean in fresh linens. Having "done something" is icing on the cake and motivation for the next day.