I think this is the time for another growth spurt so maybe that??
It’s could be a number of things. Growth spurt, Teething or even separation anxiety. It’s best to just stay consistent with babies schedule and work through the hard nights.
I did think separation anxiety as this has also started in the day too! X
My kiddo is the same age and I experience this too!! No advice as I'm struggling as well lol. Hang in there!!