Just that. She is great with everything else. Happy, healthy (at last after a few probs), eats well, drinks well, 90% of the way there toilet-training wise. But when we go to bed at 11ish and put her to bed too, she howls like mad. She did this at about 9 or so weeks, for a week. Then settled down. Now the last three nights she has gone nuts at bedtime and just wanted to run around until she was exhausted. But that's at about 3.30am 
we are shattered. She has a cosy bed, blanket and teddy in her crate in our room. Nothing has changed. Why the sudden hate of her crate/sleep/bedtime? We are wrecked. Any advice? TIA.