I've learned to avoid thinking (or at least admitting to thinking) that "tomorrow will be better." Although I can't make myself the promise that it will be better, I can guarantee that it will at least be different. I think I can be content with the idea that at least things aren't stagnant, and maybe it will even be exciting, or *gasp* "good!"
And for that, both the statement and the possibility, I will wake up and get out of bed in the morning. (And maybe try to smile unexpectedly!)