I have that problem too. I find I am overwhelmed with all that I have to do in my life and job (very stressful). I also close down when it gets dark and can't do a thing. I take classes and get all inspired but never finish so I have lots of WIPs. I have no suggestions but I am trying to take one thing at a time. Fortunately my DH does not criticize my lack of "energy". If it bothers him that much he picks up the slack. I am blessed.