I once read that a writer has to sometimes force him/herself to sit down and write at least 1,000 words a day if they wish to complete their work in a timely fashion. After finding several really good reasons to avoid work recently, I find myself back hard at it and am quite pleased with the results. I am now 1/4 of the way through my latest novel and find it flowing out as easy as I had hoped it would. For me research into history is an integral part of my writing process and something I greatly enjoy. I believe that it is the same for other writers out there.
All the best and keep writing.