I slept eighteen hours straight after taking Symbyax! The first night I took Symbyax, I couldn't drive my kids to school in the morning because I can hardly kept my eyes open and I was shaking. I slept thru the day until they came home only to go back to bed. I didn't take Symbyax for the second night as per instruction from my Doctor and took it again during the third night. But still the effects were the same. I feel so tired and wobbly and I feel very edgy when the medicine wears off.