I don't know what the answer is, but I wanted to say that I'm struggling with this too. I, like you, am generally quite self-motivated. At the moment I'm dragging myself out of bed for work at the last minute, and generally not very motivated to do anything.
I guess, what i mean is that you're not alone. I'm sorry, I can't provide any wise words of how to magic up some motivation, but if you find any, let me know!