You are right Sally - although you will be sleepy during the day if you do not get enough rest. I can sleep 24/7 if I don't take stimulants..... I do not go into the deep restful sleep that my body needs and I stay sleepy all of the time... While waiting for my last medication to be approved I was sleeping about 20 hours on average. Staying awake was very difficult and it doesn't matter how much caffeine, herbal supplements, nothing helps.