Pearl - I would agree with the others and say it's probably a growth spurt. From memory, Gab did a similar thing at 3 months then again at 4 months. It's frustrating, but it will get easier. She also did the cat-nap things which drove me crrrrazy!
They change soooo much and sometimes it can be all of a sudden. For example, for a good couple of months, Gabby slept for 8 hours on the nose - no wake ups or a dummy. Then she started sleeping even longer BUT suddenly had to have a dummy at night (which resulted in me having to get up a few times a night to pop it back in - though I don't mind if that's all I have to do).
She has been wrapped since birth and I am only just starting to try and have her unwrapped now (she's 9 months old).
Maybe you could try wrapping again?