Helen - Awww. you poor thing. Those early months are tough. I would say it is normal for bubs to be doing a 5 hour stretch or so by about 6 weeks. But your little ones were pretty early - maybe you'll find they start to settle for longer when they reach 6 weeks corrected age?
If you are really struggling and things aren't getting better - talk to your community health nurse or your GP - most states have some great residential stay clinics where you can go for a week and get help (covered by medicare) some of them will let your babies cry a lot - some won't - depends where you go. Anyway, twin mums tend to be given priority on waiting lists so don't forget to reach out for the help that is there if you need it.

leeloo - I have heard something before about soy and hormones etc. Was a long time ago so can't remember the details of what I read... and I guess if she has no family history of twins then there could be something in it for her! There's a lot of factors that give you a greater chance of having twins though - maternal age is a big one. Also possibly taking folate can increase your chance of twins (since as many as 1 in 8 pregnancies begin as twins and one twin 'vanishes' in early weeks (mostly undetected - you wouldn't know it unless you'd had a very early scan) - it's thought that taking folate can prevent some of these vanishing twin cases. There's plenty of others too... As for me - no soy here! Just a big fat fluke.