Hi,
If it helps at all we have been through a very similar patch with Sophie. She started the unsettled patch at 5 months and became increasingly so until 6.5 months. This also included going away over Christmas which couldn't have helped the situation. All our normal tactics for getting her to sleep wouldn't work. Sometimes she would wake and just want to play, sometime she would wake very agitated and crying, sometimes she was just happy to lie in her cot and coo and ooo at the wall. This invariably happened between 1am and 4am, usually for 1.5 to 3hours. I was beside myself at times with tiredness. Although this is written in the past tense, we're not out of the woods yet, she is still waking once or twice at night but mostly she just needs reswaddling then settles back down immediately. She is now 7 months.
I'm putting this down to several things which. Firstly she has undergone massive physical development in the last couple of months. She is very nearly crawling, she has learned to sit on her own in this time and solids have been introduced. She has had her biggest growth spurt ever, putting on 18oz in 2 weeks. Finally, her gums have changed and I can see teeth lurking under the surface waiting to come through, although none have yet.
The 2 things I have done which seem to have helped is increase the amount of solids I have offered her and cut out the late afternoon nap and consequently put her to bed earlier.
Hopefully we are on the way out of this phase
, although just as I start thinking that we have a bad night! But both day time and night time sleep have been a lot better this week. Two steps forward and one step back. Throughout the whole of the this I have tried to stick to the 'routine' and now she seems to be falling back into the rhythm she was in, albeit without the late nap.
Good luck and I hope in time (although sooner rather than later) you get your sleep back.
Claire