Midlife Sleep Problems Linked to Lower Psychological Well-Being Years Later

Sleep difficulties during midlife may have long-lasting effects on mental and emotional well-being, particularly among women, according to new research that will be presented at the SLEEP 2026 annual meeting.

The study followed adults for nearly a decade and found that individuals who reported sleep problems in middle age were more likely to experience lower levels of psychological well-being nine years later. The association remained significant even after researchers adjusted for factors such as age, education, employment status, relationship status, existing health conditions, and initial psychological well-being.

Importantly, the impact of sleep problems differed between men and women. After accounting for multiple variables, the relationship between poor sleep and reduced psychological well-being remained statistically significant in women but not in men.

“Sleep problems appear to have lasting negative effects on psychological well-being over nearly a decade, and these effects were more pronounced among females in our sample,” said lead author Fumiko Hamada, a researcher and doctoral student at the University of South Florida. “This suggests that sleep may be a particularly important long-term risk factor for psychological well-being in women.”

The study analyzed data from 574 middle-aged and older adults participating in the Midlife in the United States project. Participants were assessed between 2005–2006 and again between 2013–2017. The average age at the start of the study was 51.7 years, and women comprised 55% of the sample.

Researchers evaluated sleep quality using the Pittsburgh Sleep Quality Index and measured psychological well-being with a validated 42-item questionnaire. Statistical analyses revealed a clear prospective relationship between sleep problems and future psychological health.

According to the researchers, the findings highlight the potential importance of developing early interventions that specifically address sex-related differences in sleep health.

“Creating early sleep interventions that take sex differences into account may be an important strategy for preserving psychological well-being over time,” Hamada noted.

The study abstract was recently published in an online supplement of the journal Sleep and is scheduled for presentation on June 17 at SLEEP 2026 in Baltimore.