How bedtime routines help kids’ sleep

What should you do when your child’s sleeping patterns change? I’ve always been something of a stickler about the bedtime routine. The kids have them for a reason, I think, and we remain committed to them. But even with very good consistency, we still go through phases when the same old routine doesn’t quite work as well for various environmental or developmental reasons. What to do in these phases is hard to know. Do we stick with the routine as it has stood? Or do we tweak it? Is there something else going on?
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