At the very least, you'll do better making sleep changes in your child if you have some sleep under your belt, so think of it as strategic pacing. (askmoxie.org)
Kids go through so many sleep changes in the 12 - 24 month range and most really seem to be between 12 - 18 months. (babybunching.com)
Has the pattern (times of day and night), places, or posture of sleeping changed? (tampabayvets.net)