I have used a FF night diaper w/ a bumpy, bbh and SP. All work well. C's pee habits are still very unpredictable tho. Sometimes he wakes up dry (I usually change him in the middle of the night before I go to bed) and sometimes he's totally saturated the diaper. Never had a leak with this system tho. Then again, I've also used several other hemp diapers this way too (pipsqueak, crystal, tykie, SP snapin in the SP cover...)
A lot of what I can use at night depends on what dh has randomly grabbed during the day. I feel lucky that he's taken "instructions" so well thus far, that I haven't been picky about what he uses during the day. And he likes the FFs
so if he wants to use them, I just say: I'll buy more hemp
to make sure I have a couple night diapers on hand.