Always moving a mile-a-minute, this chatty and impulsive zodiac sign is prone to sleeping patterns that may be irregular. "Whenever something feels stable, Geminis are the first to want variety," Thomas continued. "This may mean that they actually don't have a regular sleep pattern, particularly because they're prone to late-at-night text and e-mail conversations." Ruled by Mercury, planet of communication, Geminis find it hard to shut their minds off, which can make it hard to fall asleep.