Objective sleep interruption and reproductive hormone dynamics in the menstrual cycle

Area of Science:

• Reproductive Endocrinology
• Sleep Medicine
• Women's Health

Background:

• Women frequently report increased sleep disturbance during specific menstrual cycle phases.
• The hormonal underpinnings of these perceived sleep disturbances remain largely unexplored.

Purpose of the Study:

• To investigate the association between objective sleep fragmentation measures and reproductive hormone levels in healthy premenopausal women.
• To explore the hormonal basis of menstrual cycle-related sleep disturbance.

Main Methods:

• Polysomnography (PSG) measured sleep fragmentation (wake after sleep onset, number of wakes) in 27 women.
• Serum hormone levels (progesterone, estradiol, estrone) were measured during the follicular and mid-luteal phases.
• Linear regression analyzed correlations between hormone levels/dynamics (PROGslope) and sleep fragmentation metrics.

Main Results:

• Greater sleep fragmentation (increased wake after sleep onset and number of wakes) was associated with a steeper rate of progesterone increase (PROGslope).
• Higher concurrent estrone levels also correlated with increased wake after sleep onset, but this effect diminished when accounting for PROGslope.
• Progesterone and estradiol levels at the time of PSG did not show significant associations with sleep fragmentation.

Conclusions:

• The rate of progesterone rise during the menstrual cycle is a significant factor associated with increased sleep fragmentation.
• This study establishes a direct link between reproductive hormone dynamics and objective measures of sleep fragmentation during the luteal phase.