Girls.......in terms of the 45 minute sleep cycle.........have you tried using a baby CD to break the cycle?

Olivia, at first (newborn to 4 months) was a shocker for catnapping in 40 minute stints and was a cranky pants, then we started using "Peacebaby" and within just a few days she started sleeping for up to 3 or 4 hours in the day and 12 hours overnight! We had it playing quietly on repeat on a cheapo stereo in her room.

I have since used it for Charlie and Lexie and same deal......long day sleeps and long night sleeps.

Peacebaby (Google it: their site is interesting!) has 5 or 6 tracks, with a 60 beat per minute backing (same as a heartbeat) and it works like a charm for us. Plus it relaxes ME, LOL!

(Olivia is now over 3 and still asks for "special CD please Mummy, for sleeping......." LOL!)