Hi there Naranjadia ,
A warm welcome to you , I'm glad you found us
Have you talked to your doc about this - I really think you should so you can have a back up stratagy/plan.
I have had a child and the father wasn't around to help , I know it's a cliche but us mothers just seem to find ways of dealing with things. Once I found my true love , my baby was 6 months old , by the time she was 12 months he was helping me , so if it is possible for your husband to help in the night then ask him. I found taking a night each was better than taking turns each time baby woke up.
I'm not sure about relapses as I have only once been hospitalised ( they didn't quite know what was wrong anyway) although my mania is getting more frequent.
Take care and keep posting ,
CONGRATULATIONS on your twins