I have the regular 4 hour tabs. I tried taking one last night. I was picked for jury duty yesterday and spent most of the day from 8:30 to 5:00 sitting. My feet were bothering me before I went to bed so I took a Tramadol and it *worked*! I was able to fall asleep no problem. Thank goodness! It's not every night that my feet bother me now but I had a night earlier in the week where I don't think I slept at all. It seems once I'm actually asleep they no longer bother me and they're always fine when I get up in the morning.