i've had a few sessions of regular b/h, and it can get annoying, especially when you're trying to sleep.
i agree about the water... often that's my problem.
sometimes a little alcohol will calm things (if you've already drunk a bunch of water). hops, skullcap, lobelia and/or valerian tinctures could help if you aren't getting ANY sleep at all, but i would definitely talk to your midwife before starting them (i know lobelia, for one, can cause problems with someone who has had a history of siezures, for instance).
one other method... sometimes a funky uterus will knock out of a b/h spell with a good strong orgasm!