Since getting back from holiday,my 11mo girl has been crying hysterically before going to bed including nap times. The only thing that works is letting her fall asleep on me then transferring her to cot. She's had moments in the past but usually a good sleeper. I'm worried because she starts nursery in 3 weeks and at her grandparents some days when I return to work. Any tips? Room on hols was very dark at night so maybe she finds her nursery now too light?