But if your relationship is fraught with strife, be prepared for long nights spent tossing and turning, new research suggests.
In a study of nearly 3,000 women, those who were in unhappy unions were about 50% more likely to suffer symptoms of insomnia than their happily married counterparts. Unmarried women were about 30% more likely to have trouble sleeping than women in happy unions.
The findings were presented at SLEEP 2008, the 22nd Annual Meeting of the Associated Professional Sleep Societies.
Which Comes First: Poor Sleep or Marital Strife?
"There's been a lot of research showing that married women sleep better than divorced women, but not much has been known about whether the status of that marriage affects sleep patterns," says Wendy M. Troxel, PhD, a psychologist at the University of Pittsburgh.
"What we found," she tells WebMD, "is that unhappily married women didn't differ much from unmarried women as far as insomnia goes. It's not marriage per se that is beneficial, it's a happy marriage."
The study leaves open the question of whether marital discord makes it harder to sleep or whether poor sleep can ruin a perfectly good marriage.
Troxel suspects it's the former. "Our hypothesis is that if you have a sense a support, someone with whom to unwind at the end of the day, you'll be less stressed and better able to fall asleep.
"An unhappy marriage, on the other hand, can be a source of stress. It can be harder to fall asleep when you're fighting with someone, particularly if they're lying next to you," she says.
Donna Arand, PhD, a sleep specialist at Kettering Hospital Sleep Disorders Center in Dayton, Ohio, agrees. "We've known for some time now that sleep is impacted by what happens to you during the day. Activities that promote stress and anxiety adversely affect sleep, and marital discord is certainly a major stressor," she tells WebMD.