More than a third of Americans say they occasionally or consistently sleep in another room from their partner, according to a survey from the American Academy of Sleep Medicine. "We know that poor sleep can worsen your mood, and those who are sleep deprived are more likely to argue with their partners. "Studies demonstrate that when one bed partner has a sleep disorder it can negatively affect the other sleeper. For example, bed partners tend to wake up at the same time when one has insomnia. Similarly, when bed partners differ in chronotype, like when one is a night owl the other is an early bird, these differing sleep preferences can negatively impact both partners' sleep."