My DD is 20 months old and has ALWAYS been a good sleeper (14 hrs a day). For a week now, we've been putting her to bed as normal, following her bedtime routine, but as soon as we lower her into her cot, she screams! We can be upto 3 hours trying to settle her off.. when she finally goes off, we can wake up after a few hours with her screaming again. We bring her into our bed and she sees it as pleytime, bouncing on our pillows, etc. She'll seem happy enough, so we put her back in her cot, she screams. Her daytime nap is also the same, yet she's SO tired. What's wrong with her? I don't think she's in pain, she normally loves her cot. She hasn't waken due to a nightmare either, before this happened, so... HELP.. ANY IDEAS?