*hugs* Meredith... we are in the same EXACT position with sleep atm. Jovie will not stay asleep longer than 15 minutes or one sleep cycle... and if she wakes it can take up to an hour to get her back to sleep. The HAB is the only way I can get her to sleep longer, but that is the only way... everything else including co-sleeping for a nap during the day doesn't keep her asleep

So... no advice, just commiserations. Hopefully our little ones will learn to sleep longer.