If it's coming near the end of a chapter and I'm really getting into it, I tend to get up earlier and earlier, just because I'm excited to get to work.
Try not to do too many things at once. Know what you want, the number one thing today and tomorrow. Persevere and get it done.
A very wise author once said that a writer writes for himself, and then publishes for money. I write for myself and publish just for the reader.