There is evidence that sleepiness and fatigue can be side effects of maca root use, however, they seem to be symptoms of overuse rather than just side effects of taking low doses. This means that when people keep to a 3-5 gram daily intake routine, maca root doesn’t tend to make them sleepy.
An exception can occur when the person is taking other supplements alongside the maca root such as extra potassium. Such intake shouldn’t be necessary, however, as maca root already includes an abundance of potassium. Just to be safe and to avoid any potential side effects, always consult with your physician before taking maca root and/or mixing it with other supplements.