My daughter turned 10 months on the 22nd of this month.. for the last three weeks, most nights have been awful for sleep. She wakes in the night screaming and sometimes won't sleep for hours.. one night was so bad she wouldn't sleep until 5am. We were giving her calpol as we thought it was teething but that was not working so we figured she wasn't in pain? She's slept great since two and a half months old barely needing us in the night but this is the worst it has ever been. Tonight, despite being tired from nursery she just would not go down to sleep in her cot and screamed. Now I feel awful as she's fallen asleep (after the 5th time trying) but I had to leave her crying for a few minutes :( is this a sleep regression or separation anxiety? How long will this last because it's even caused me to take days off work due to tiredness..