If by side effects you mean, a more enjoyable and fulfilling life, than yes. There are plenty of those kinds of side effects. I have never experienced anything bad, from a lucid dream. If anything, I would bet that it enhances your intellegence and mental abilities. I mean, look at our members. Do we seem stupid to you? It also helps to rejuvenate and invigorate me, also. It's as if I get more rest when I'm in an LD.