Please someone help! My twins are 22 months old, and have been amazing sleepers for the last year or so, getting a solid 12 hours each night. A couple of weeks ago this all changed, and now they tend to wake up between midnight and 1am for the day! Nothing I do will settle them back to sleep. They don't want comfort - I'd happily bring them into my bed if they would settle, but they just start climbing on everything. They start shouting to go downstairs and get increasingly angry when they can't. Last night I cracked and let them go downstairs at about 3am (I know, how stupid! But they'd been shouting for hours) I just don't know how to deal with them. Obviously they are being awfully grumpy in the day now too as they're so tired. They are still having a decent nap for a couple of hours each day, from around 11am. What on earth do I do??