Had a long talk with the pharmacist about it, and he said because I am older, my body takes a long time to break it down, which is why the grogginess and can’t-stay-awake-ness???? lasts all day. Gave me some ideas to discuss with my doctor. Meanwhile, I think I am going to try taking it in the morning, to see if that makes a difference. Will keep you posted. I’ve been awake a total of three hours so far today, and it’s 6:30 pm. At least I’m not groggy when I am awake. Was in a total daze yesterday. Fun times.