Disturbed sleep_5 month old. Again?

My baby is 5 month old and on EBF. She had started sleeping through night from 1.5months for 4-5 hour stretches and I used to feed her 1-2 times at night when hunger cues are shown. However, from past 1 month her sleep is very disturbed. I follow a bed time routine_warm body bath, new clothes and dark room around 9.30 pm. But mostly from midnight she starts active sleeping - moving her hands and legs and starts turning to sides or roll over with her eyes closed. I have to settle her back to sleep by feeding/ patting for a while. This happens every 2-3 hours and hence affecting my sleep as every time I have to settle her back otherwise she will wake up. Sometime she doesn't sleep back and stay awake for 2-2.5 hours at night. She is sucking continuously at night now for comfort. morning naps are also shortened to max 30-45 mins for 2-3 times/day. I heard about 4th month sleep regression. Is it the one ? How long will it last? What can I do the make I sleep through night again ?