I just wanted to add that I did sleep with my twins (and 4yo) every afternoon. I never did that with my first dd, but needed it desperately with all three kids. I found I could nurse both twins in bed and then lay down with one on each side of me. Each would be on their side facing me with their heads kinda in my armpit/shoulder and my hand under their bottom. Then I could pat/bounce them until they fell asleep. Older dd would lay down in bed with us too and we would all sleep together. I did this until the twins were 6 months old, then I started working on getting them to sleep not in my arms. I still nap when/if I get all three kids down at the same time. :)
Oh. . .and my housecleaning standards have really dropped. They are only now returning with 2.5 yo twins.
I am still alone almost all the time (dh works 14-18 hour days) and can manage. Bed times are the hardest, but you get a routine and the kids get used to it.