Hi Rach,
I really feel for you. Sleep deprivation is the worst form of torture!! Remember what you have been through physically and emotionally and be kind to yourself. I can remember feeling so so tired in the early days but it doesn't last forever (although it seems like it at the time).
I agree with cmf that routine was our lifesaver. We always always woke one when the other woke for a feed and always put them to bed at the same time. This got them into a pretty good pattern for nighttimes after a few weeks. My DP also got up through the night to help with feeds and nappy changes but then he had 6 weeks leave from work so we could then both sleep through the day when the babies did.
We went to Tresillian at 19weeks when ours were doing a dual crying marathon from 4-10pm and I was feeling like I was going to go crazy. It really was the best thing we ever did as it taught us how to settle and to listen to the crys and work out what the crying was meaning (hungry, grizzly, distressed etc). We were there for a week and it is a great rest in a way because all you have to focus on is the babies (no housework, meals, washing, visitors etc). There were people in there with babies as young as 4 days old (they came straight from the hospital). One of the great things where I went was they gave the mothers a night (or two if necessary) to sleep and they took the babies (brought them back for feeds if breastfeeding or gave them the bottle themselves if bottle fed). It is really great to have some professionals to talk to about the crying and to help establish routine with and other mums to talk to as well. It is definately best to get on top of sleep problems as soon as possible for your own sanity and for the babies

I had to get a referral from my GP and I called and said I needed to go sooner rather than later and they got me in the next day. They told me they have twins just about every week. Remember sleep issues are escalated with two and I think it seems way more unmanagable when you have two babies crying and you're tired.
I hope this helps and you are able to get some help from somewhere, if not tresillian. Keep us posted and sleep, sleep, sleep whenever you can!!
Julie
DS Luke 6/8/04
DD Jenna 6/8/04
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