Has anything changed recently in the rhythm of his life to knock things out of balance (we're still not over the time change here!)...Have you been under more stress than usual? Is he near a half or whole birthday? Teething? Is he watching a lot of television? Eating not-as-healthy foods? When I run down my list of "why-is-this-happening" and run out of ideas, I usually chalk it up to the enormous challenges of toddlerhood and remind myself that, someday, sooner than later (!) it will pass.