I've been taking sertraline (50mg dose) for about six weeks now to help with PMDD. It's been brilliant apart from one side effect: my sleep is ruined! Whilst I have no problem dropping off, I am waking up around 2:30 every morning without fail, and then waking frequently. In addition, I am getting some full-on dreams. Last night, Putin had given the world its 3 minute warning, for example! I am exhausted. Is this something that is likely to wear off, or do I need to have a chat with my GP?