We've struggled with our almost 2.5-year old and sleep on and off since he was born practically. We're super consistent and he goes through long stretches (months) with no problems. But here he is again, at bedtime, crying in his crib. Last night he was up at midnight and then for good at 5am. I keep wondering what we're doing wrong, or if this is just how he is. Has anyone else struggled this long with sleep? Any thoughts or words of encouragement?