We’ve got into a horrible rut whereby our almost 1 year old won’t go to bed without getting really upset first.
If I stay in her room with her she just will not go to sleep (we are talking hours!) but it quite happy.
If I leave and swap with my husband she will hysterically cry, as in hyperventilating / can’t catch her breath / very distressed. She is doing this within seconds of my leaving, before he necessarily gets to her room.
However, once I go back in she stops crying as soon as I pick her up and then once she has calmed down she will go to sleep within 10 minutes.
I’ve tried leaving her with him for around 10 minutes but she cries the whole time 
It feels like such a sad way for her to go to sleep every night, not to mention being shite for us parents too!
We don’t really know how to change this...