... about a week and aside from feeling like a zombie the entire day, every evening I have taken it I wake up with a migraine. No medication is worth daily migraines to me, especially when the medication does not work! I've been shakey, unsteady and am bruising a lot. Any other choices out there that are rated as useful without these side effects? I'm desperate here, I haven't slept for more than 3 hours a night for the last 3 weeks... should I just look into sleeping pills?? ANY advice is good advice to me at this point! Thanks gang!