Key Takeaways:
- Sleep disturbance was associated with significantly lower scores on all three SF-36 subscales assessed, whereas VMS alone did not reach statistical significance on 2 of the 3 domains—indicating that sleep has a larger independent effect on health-related quality of life than hot flashes alone.
- The co-occurrence of sleep disturbance and VMS produced the greatest quality-of-life impairment, particularly on role limitations due to physical health (mean difference −4.76) and energy and fatigue (mean difference −3.70).
- Because women wake up following a hot flash approximately 75% of the time, VMS and sleep disturbance frequently co-occur — making sleep an important and often underaddressed treatment target in menopausal care.
Sleep disturbance has a larger independent effect on health-related quality of life during the menopausal transition than vasomotor symptoms alone—and when the two co-occur, the combined impact on physical functioning, emotional well-being, and energy is greater than either symptom in isolation, according to Pauline M. Maki, PhD, whose analysis of Study of Women's Health Across the Nation (SWAN) data was presented at the SLEEP 2026 Annual Meeting.1
The analysis drew on baseline and 10 annual follow-up visits from SWAN, spanning 1999 to 2008, among 2066 participants who reached natural menopause at a mean age of 51 years. Participants were grouped by symptom profile—VMS only, sleep disturbances only, both, or neither—and health-related quality of life was assessed across 3 SF-36 subscales: role limitations due to physical health, role limitations due to emotional problems, and energy and fatigue.
Across all 3 subscales, women with sleep disturbances alone consistently scored lower than the reference group with neither symptom. The impact was most pronounced when sleep disturbances co-occurred with VMS—particularly on the role limitations due to physical health subscale (mean difference −4.76; 95% CI, −6.45 to −3.07) and the energy and fatigue subscale (mean difference −3.70; 95% CI, −4.55 to −2.86). VMS alone did not reach statistical significance on the VMS-only subscale for 2 of the 3 domains.
"The bottom line is that sleep has a bigger effect than hot flashes, and that sleep disturbance has a particularly notable effect when it's combined with vasomotor symptoms," Maki said. "It was really the sleep—either alone or in combination with vasomotor symptoms—more than vasomotor symptoms alone that seem to associate with worse health-related quality of life."
The findings offer an important corrective to the clinical framing that typically centers hot flashes as the defining symptom of menopause. Maki noted that approximately 40% of women experience worsening sleep during the menopausal transition, primarily characterized by nocturnal wakefulness. The two symptoms are also closely temporally linked: Studies show that women wake up 75% of the time following a hot flash during sleep, making the co-occurrence of VMS and sleep disturbance the modal clinical presentation rather than the exception.
"We hear a lot about hot flashes because they're the hallmark symptom of menopause," Maki said. "But it's important to understand which of these symptoms, either in isolation or in combination, affect women's health-related quality of life."
The SWAN data suggest that directing clinical attention toward sleep—not just VMS—is essential to meaningfully improving quality of life for women across the menopausal transition.
REFERENCE
1. Maki P, Dinkel-Keuthage C, Nadimi M, et al. Associations between sleep disturbances, vasomotor symptoms and health-related quality of life in the menopausal transition and early postmenopause. Sleep. 2026;49(Suppl 1):A371
