I have to say that the nighttime is predominantly when my symptoms flare up. I can be woken out of a sound sleep and do get the sweating. I have pretty much learned to just cope but recently have been wondering if something else is going on. So many people say that nighttime waking is NOT an IBS symptom, but it's pretty much the only time for me. As soon as I lay down, my intenstines start going. Sorry I don't have any grand answers, just support for you saying your not alone. Anyone out there with any advice would be appreciated.