I just started taking this not quite a couple of weeks ago, and for the past few nights I've went to bed with no issues, but waking up in the middle of the night to severe headaches, centered right behind my forehead. The first night it was so bad, I couldn't go back to sleep until the Tylenol kicked in. I've also had them every morning since it started. Took Tylenol and have no other headaches the rest of the day. I read that headaches are a side effect, but night headaches?