My 4.5 month old is having major trouble getting down at night. She goes down fine usually between 6:30-7:30pm and straight to sleep but treats it like a nap and wakes after an hour then is impossible to get back to sleep, she cries and refuses and sometimes is awake till after midnight! She has a dummy, white noise etc and can self soothe at every other nap. It's been happening for 2 weeks straight and I dread the evening's now. Any advice would be great, thanks!