To optimize your fertility, prioritize sleep: in women, a lack of rest is reported to reduce the number of oocytes retrieved, while in men, it is said to lower testosterone and sperm count.

noli's read

Research confirms a close link between consistency of rest and reproductive vitality indicators, although the relationship is not purely linear. For women, prospective observational studies (such as Yao in 2022) associate insufficient or poor-quality sleep with a decrease in the number of oocytes retrieved during assisted reproductive protocols. However, other cohort studies (such as Park in 2013) do not observe this direct decrease, instead highlighting a U-shaped relationship where a balance of 7 to 8 hours offers the best chances of success. On the male side, an experimental sleep restriction clinical trial (conducted by Leproult and Van Cauter) demonstrates that significant deprivation measurably lowers daytime testosterone levels. Similarly, large observational studies (such as Jensen in 2013) report that rest of less than 6 hours per night is correlated with lower sperm concentration. Presenting this impact in a strictly mathematical way ("every hour less") is therefore a marketing simplification of a complex biological dynamic, but the scientific foundation remains solid.

the sources

1. 1Watson NF et al. (AASM & Sleep Research Society) 2015
2. 2Hirshkowitz M et al. (National Sleep Foundation) 2015