I slept something like 14 hours last night and was still groggy when I woke up. It seems to have helped though as I don't feel quite as wretched today as I did yesterday. I'm not well yet, but I'm not having to keep taking aspirin for my constant headache either, so I'm counting it as an improvement. The headache isn't GONE mind you, but its much diminished. Similarly the tummy is not yet well, but it only grumbles slightly at the thought of food now.