BAD Sleeping Habbits

So, I am REALLY enjoying my visit home.  We have been busy and doing lots of fun stuff.  I have absolutely no reason to complain, especially since Brenna was such an angel on the flight here... but just a little bit of complaining anyway!  It is currently 4:33 AM here in Calgary, and I am up.  Not only am I awake, but I have been for about 3 and a half hours.  So I went to bed around 11:30, and at about 1 I was awoken by a crying little girl sleeping at the foot of my bed.  This has been happening every night, and usually lasting for two hours before I can get her to sleep again (with me downstairs on the couch usually).  Last night we made headway though, and silly me I thought it would be a breeze from here on out.  WRONG!  Now it's her worst night so far!  I have tried everything..  I tried to cuddle her in my bed.. didn't work.  I tried to let her cry it out (for over 40 minutes with me saying silent prayers the entire time).. didn't work (also woke up everyone else I'm pretty sure).  I tried to feed her a bottle... she ate it, but.. didn't work.  After some more cuddling in bed and me nearly breaking down like a baby myself.. I finally relented and brought her downstairs to play for a little...... HELP!  I don't know what else to do, and I might just go insane if this continues.  Naps are fine, which makes me optimistic, but nights are nightmares!  I am hoping it gets better, but dreading the idea that maybe, just maybe, it'll get worse!