This resonates so much with me. Most of the time I find that I'm just in this automatic mode of operation of working->family_time->sleep->back to work for 5 days a week. By weekend, I'm so tired that I just want to relax by listening to music or walking.

However, there are some rare moments when I have much more energy and willpower, and I push through and really am onto something, until sleep deprivation catches up to me again.

I guess some people have more natural energy and determination than others, and probably I'm on the lower half.

I'd love to try and make it so that I don't subconsciously fall into this mode of operation when I really need to be creative.