I slept very deeply and for a long time, about 9-10 hrs. It depends on what time I fell asleep. I had another headache that was keeping me awake, got up and took it with a few swallows of Pepsi. I was hoping the caffeine would help. But I think my headaches are from my neck. Back when I was in so much pain and they did mris. And X-rays both my back and neck were out of alignment. Had surgery on my back and that took care of the pain until recently. My neck is hurting and I think it’s the Alinement. I have constant headaches, nerve damage symptoms in my right arm. I’m not going to a chiropractor, no way. I don’t like them messing with my neck. I’m afraid to go to the regular doctor as they will probably recommend surgery again. I’m doing the neck exercises they showed me and hoping that it will go away.