Sometimes when working on a long term project somewhere near the end I loose it. What do you loose Flora? you may ask Sometimes it's the desire to continue the project. Sometimes it's the energy or the brain capacity to think about the project. Some times Life gets in the way and it's difficult to fine the thread of the project. Sometimes it's the creative spark that sent me on the journey in the first place.
All in all I find it difficult to re engage my head if I'm just not feeling it. For me the only way to get back to a project is to set it aside for a time and let it marinate in your lizard brain for a while. And then all of a sudden, POOF! It's done!