Sleep is particularly critical during the preconception period, as it can impact the health of both women and their potential offspring, but data specifically on preconception sleep health are scarce. The study objective was to document sleep health and its correlates among preconception women. Females (18-45 years) from Canada and who are trying to conceive were recruited to participate in the PREGO Study. Sleep health (duration, quality, and disorders) was measured using the Sleep Health Index. Sociodemographic (age, marital status, level of education, income, ethnic or cultural origins, weight and height), pregnancy-related (gravidity), behavioral (physical activity level, alcohol and caffeine intake, nicotine and cannabis use) and psychological (marital happiness, life satisfaction, depressive and anxiety symptoms, stress, psychological distress) data were self-reported using validated questionnaires. Multivariable linear regression analyses were used to identify correlates of preconception sleep health. Preconception sleep health data were available for 620 women (mean age: 29.9 ± 3.5 years; 67.6% nulligravid). Participants' global sleep health score was 71.5 ± 14.4 (out of 100, with higher scores indicating better sleep health) and 81.3% had sleep duration variability between weekdays and weekends. Depression (β = -1.60; 95% CI: -1.99, -1.22) and life satisfaction (β = 0.39; 95% CI: 0.11, 0.67) were significant correlates and explained 16% of the variance in sleep health. Preconception women appear to have good overall sleep health, but for many their sleep duration varies between weekdays and weekends. Having higher levels of depressive symptoms was associated with worse sleep health, while good sleep health was associated with higher life satisfaction. It may be worthwhile to ask women wishing to conceive - especially those with depressive symptoms - about their sleep health. These results can be useful for healthcare providers with female patients planning a pregnancy and preconception women who wish to optimize their sleep health as it may benefit both women and their future offspring.