K.N.
D. --
I have twin boys who are turning 2 in a few weeks. Sleep was ALWAYS an issue with us until about 6 months ago. My 2 were in the same room - and if one woke up, he'd wake the other. We separated them into 2 different rooms and that helped some. However, the only thing we found is that they both want to sleep in bed with mommy or daddy. When we've gone on vacation, I've had them sleeep on ready bed air mattresses on the floor and they've been fine. It seems they just want to sleep near someone. I know it's not ideal to have them sleeping in bed with me, but to be honest, it's the only way we could all get some sleep (including my almost 11 yr old son who would hear them crying at night and it would wake him up and then he would be tired at school the next day).
We are not fans of the CIO (crying it out) method for several reasons....but the biggest being that one of my twins has a heart condition that is very serious and if he cries really hard, he expells all the air from his lungs and basically passes out (I'm told it can happen and is somewhat normal in toddlers but scary just the same).
As long as my 2 are sleeping together or with someone, they sleep a good 10 hrs or so and take a nap for 1 1/2 - 2 hrs daily. My 2 are very affected by sunlight...so they won't sleep unless it's dark or a darkened room. Also, they dropped their morning nap at around a year old. In addition, I found that keeping them warmer at night helped them sleep better (they still wear long sleeved pj's and pj pants an socks in the summer due to the air conditioning on in the house and the ceiling fan on in the room and the cooler night air). I think this helped a LOT.
So, all I can say is, see if there is a pattern, and do whatever works for all. A book that I liked was titled something like "the no cry sleep solution" and we tried that too and it seemed to help. Another thing that helps with my 2 is having a sound machine. They like the sound of white noise or the ocean waves or the heartbeat. They also both like sleeping with a pillow and having stuffed animals near them.
Are you in a Twins mom group? If not, I highly recommend joining one (or 2) -- the moms in those groups can be very helpful with information and ideas. Send me a private msg. if you want more info on Twins moms groups.
--K.