Marriage may improve your sleep, and better sleep may improve your marriage, two new studies suggest Women who are married or who have stable partners【C1】______to sleep better than women who have【C2】______a partner, according to research from an eight-year study【C3】______at the Associated Professional Sleep Societies annual meeting. They also found that marital【C4】______lowers the risk of sleep problems,【C5】______marital disharmony heightens the risk and women who were single at the start of the study but gained a partner had more【C6】______sleep than women who were【C7】______married. The study included 360 middle-aged women. Researchers used in-home sleep studies, activity monitors to【C8】______sleep-wake patterns and relationship histories to look at the【C9】______of stable marriages, unstable marriages and marital changes, such as a【C10】______had on sleep. Another small study of 29 couples found that on a【C11】______basis, the quality of a couple's relationship and the quality of their sleep are closely linked. In that study, from the University of Arizona, 29 couples who【C12】______a bed and did not have children【C13】______sleep and relationship diaries for fifteen days. The results showed that【C14】______men get better sleep, they are more likely to feel【C15】______about their relationship the next day.【C16】______for women, problems in the relationship were strongly【C17】______with poor sleep for both themselves and their partner. The【C18】______from both studies suggest that sleep and relationship happiness are closely linked. The lesson for couples,【C19】______those who are struggling with problems, is that paying attention to sleep habits may help【C20】______other issues in the relationship.