My 9 month old twins sleep next to me in their crib (and occasionally in our bed). They originally slept in a large cosleeper until they outgrew it. I can’t imagine any other arrangement when it comes to dealing with two babies at night.
The benefits of cosleeping with twins:
1. You never have to get out of bed at night. You simply pull them out of their cosleeper/crib, feed, return them to bed, and roll over to go back to sleep.
2. You will hear them in their early stages of waking up rather then screaming through the monitor. That said your babies are less "awake" when you feed them, and thus return to sleep easier.
3. They can easily be pulled into bed when sick. Depending on your stance about sleeping with a child in your bed, I can say that a sick baby sleeps much better snuggled up to you than alone. I am not sure if it is just me, but my babies (who sleep on their stomachs in their crib) always sleep on their backs when in bed with me. Thus, when they have colds, their noses drain much better. If they are in their crib, they constantly wake up from being unable to breath.
4. You can enlist your husband's help when needed. Enough said. Until about 6 months old, my husband was responsible for night-time diaper changes. Now that they only get one change, we share the job. (What a keeper he is!)
5. Breastfeeding is much easier. This also relates to #2 - only it is much easier for you to return to sleep.
You get up, throw on a robe, walk into a cold room, get two babies out of cribs (which logistically is quite hard once they are mobile), breastfeed, burp, return them to bed, go back to your room, and crawl back into a now cold bed.
You sit up in your cozy bed. You pull one baby into bed and lay them next to you. You place the other one in your lap. You or your husband places the second baby into position. You breastfeed both babies at the same time while leaning back against a soft pile of pillows already in place. You burp the babies, and then lay one next to you in bed. You then return the first baby to the cosleeper, followed by the second. Finally, you roll over into your warm, yummy bed and fall fast asleep.
6. It is easier to let them cry. Lately my babies have tried to establish 2 am as "play time." This required that I let them cry it out a little for the first time. It was actually easier than I thought, because I could see their sillouettes in the dark and I knew they were OK.
I am a little biased towards cosleeping. Can you tell?
(Thank you to my new twin mom penpal Sarah for inspiring me to write this.)