I got a cereal called "Mesa Sunrise" by "Nature's Path" that, when I ate it in the evening, made it so I slept through the night without having to get up and poop. I have tried to have psyllium before bed and it hasn't worked like that so far. I'm going to keep experimenting. The 3 nights in a row I had the cereal and slept through the night, I was really tired so it could have just been that. Further testing is needed. Also, the Mesa Sunrise made for good poops the next morning.