Our 16 month old dd has been sleeping really well for the last few months. Over the last 2-3 weeks we settle her down around 8pm as normal but she will start screaming crying and hyperventilating around 2 hours later. She doesn't seem to be awake as eyes are still closed and itching we do soothes her. This lasts for around 5-10minutes then she will take her bottle and settle down for the rest of the night. I have I idea what to do to help her. Tried gentle soothing to reassure her, even resorted to trying to wake her properly. Hate seeing her so upset and don't know what to do to help! Any ideas massively appreciated.