Nytol side effects restless legs Active Ingredient:. " Side Effects: restless legs, extreme nausea and anxiety, insomnia, rapid heart rate, tinnitus, anger and panic. Has anyone else experienced anything like this after taken a herbal sleep aid? Written by dahon. Many say CBD helps in the absence of conventional medicine alternatives and with few troublesome side effects. 4 Nytol (the stronger sort) and Two soluble co-codomol, but it hasn't heped at all.