After a long day at the playground or the pool, you would expect your child to fall asleep easily at night. But many kids are still fired up in the evening after a particularly exciting day. They grab building blocks and hammer against the heater, romp across the sofa and the beds, refusing to calm down and go to bed. Social education expert Dana Mundt, who works for an online consulting service in Germany, encounters this problem a lot. How can parents calm down toddlers between the age of 1 and 2, particularly ahead of bedtime? Dana Mundt: The most important thing is to prevent them from bec…