I can't offer any advice. Just much sympathy...
From 4 months on, my little Abigail has slept from 7pm to 7am like a champ, no wakings, no crying, no peeps. We could set our clock to her. I didn't know how lucky I was...
Since daylights savings (I don't know if it was coincidental) she has been waking up early. Sometimes it is 4am, sometimes, 5am, sometimes (if I am lucky) 6-630am. I have tried EVERYTHING and I mean everything, (feeding at night, giving Motrin/tylenol in the middle of the night, turning a fan on, putting her in something warmer, something lighter, etc) NOTHING has helped. She seems to have overnight gone from needing 12 hrs of sleep at night to needing 10 hrs of sleep at night. It sucks!
PLEASE let me know if you find anything that helps!
My tired thoughts are with you