Survey study, 2005
How does sleep affect hormone pulses during the menstrual cycle?
When women slept, their LH pulses (fertility hormone) occurred less frequently but stronger. Brief awakenings 5-15 minutes before LH pulses suggest sleep interruptions trigger hormone release. This small study (11 women) examined one cycle phase, limiting broader application of findings.
What they did
11 women underwent sleep monitoring and frequent blood tests to measure LH hormone levels during the early part of their menstrual cycle. The study had three periods: one normal night of sleep, one night without sleep, and one afternoon nap.
What they found
LH pulses were more widely spaced during sleep than when awake. LH pulse strength was higher during sleep. Brief awakenings happened 5-15 minutes before most LH pulses. Time of day also mattered, with higher LH levels in the evening when not sleeping.
What it means for you
Sleep affects key fertility hormones, which might help explain why sleep is important for menstrual health. The main limitation is the very small sample of 11 women, and the study only looked at one phase of the cycle, so findings may not apply throughout the menstrual cycle.
11
women studied
40 hours
observation period
5-15 minutes
before LH pulses when waking occurred
About the study
- Original title
- Brief wake episodes modulate sleep-inhibited luteinizing hormone secretion in the early follicular phase
- Authors
- Hall JE, Sullivan JP, Richardson GS
- Journal
- The Journal of clinical endocrinology and metabolism
- Year
- 2005
- Study design
- Survey study
- Participants
- 11
- What was tested
- Sleep deprivation and waking protocol during follicular phase
- Open access
- Yes
- Read the paper
- doi.org/10.1210/jc.2004-2033
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