My 5 month old has recently started not sleeping during the night. At 12 weeks she was sleeping from 8pm-4am. The last 6 weeks she has been waking again at 11pm, 2.30Am, 4.45am, 6.30am. I breastfeed on demand and usually when she wakes in the middle of the night I feed her for approx 5 mins and she will go back asleep. The last two nights however she is waking every 40-45 mins from as soon as she goes down. She wakes up screaming as if she is in pain and i sometimes can soothe Cher back to sleep rather than feed her. Anyone else experienced this? Any suggestions on how to deal with this or do I just have to ride it out?