Writing block

Tonight I'm going to bed without having written a word.  I don't know what's wrong with me; I've been blocked all over.  I can't even edit my stuff right now.  I look at a story and make notes to myself about what I want to change, but I just can't seem to make anything happen. 

I'll try again in the morning.  Any advice, tips, or prompts?  I'd be happy to show you something in the fandom of your choice if you think you could kick start the story for me.  I've got one Jack/Sky, one Adam/Tommy, two House/Wilson, and two Jack/Daniel.