Yeah, it's like a New Year's resolution... hard to keep up beyond the initial push. Personally, my solution to this was starting a collaborative log (via google docs.. which has a mobile app, phew) with my sister (same logic for any close friend or family member). You sacrifice some freedom of expression, but it keeps you both accountable, knowing that someone is expecting to read whatever you've written on a given day. It's also a great way to get feedback on your thoughts. Good luck!