Food inspires me to write. As odd as it is, around super time I suddenly feel like writing. It doesn't usually work, though, because I'm too hungry. The point is food stimulates your brain. Make sure you eat appropriately. I also find that ideas come to me when I'm in the shower and when I'm going to sleep at night. I'm glad that they come to me, but it's a hassle to write them down or remember them at that time.
Then I realized; what correlates these circumstances is the physical stimulation to the brain. You're either thinking nothing, or doing something, i.e. getting the brain going. If you make a list of what usually gets you into your writing mood, you could maybe find a way to boost your writing time by doing similar activities. Easy, right? It makes you think back to when you had writer's block; it must have been like putting your brain into one of those cry rooms- wow- how did we believe there would be any results? Poor brain....