Hi Lewsi's Mummy, Nelle had her little boy, checkout the birth announcements.

I use BBH bamboo at night, cute tooshies bamboo with extra booster, or a BumG with 2 inserts. (My girl usually sleeps 10-12hrs) I havn't had any problems so far, although as DD is getting older i am finding the nappies quite wet in the morning.
Is your bamboo BBH soaked after 90min????? You may need a dedicated night nappy or two.....
There as specialised night nappies out there, google "lotus" "wildchild" "bubblebubs" All of these companies have night nappies that are super absorbent. I have just ordered a lotus so will let you know how it goes!