dd (3.5) has suddenly stopped sleeping through the night approximately 2 months ago. She will settle to bed around 7:30pm as normal but will then wake crying at around 10pm. She will then wake several times, up until around 3am. It can range form a whingy cry (she doesn't even appear to be fully awake at times) to full on screaming and shouting. This can be intermittent or go on for hours on end. I am at my wits end. Dh and I both work and it is beginning to effect our ability to work. We have another dd (8) who is frequently disturbed by her. We have tried everything we can think of to try and settle her, new nightlight, new pillow but nothing has helped. There have been no changes to her routine at nursery or home, or significant events. She is generally fit and well apart from having asthma, which is currently well controlled and has been on the same medication for several months. I want to speak with my health visitor but dh thinks this is just a "phase" and I am over reacting. It is however now impacting on all of us and her behaviour during the day hasn't been good recently, mainly due to her being so tired and grumpy. I'm worried I am missing something? Is this just a phase or should I seek some professional advice? She has already woken up 7 times tonight. Any advice would be greatly appreciated, thanks.