The zodiac sign most closely connected to domesticity and the home, Cancers are ruled by the Moon. "This means that they have a sensitive and emotional personality, and like the ever-changing tides, Cancers may have fluctuating sleep patterns that ebb and flow," Thomas says. Obsessive about their always shifting emotions, Cancer's sleep will directly be connected to how peaceful they truly feel within. So, keep stress at bay and you'll be sure to snooze soundly if you're a a Cancer.