What question did this study set out to answer?

This research examines the fluctuations in plasma levels of LH, FSH, testosterone, and estradiol during sleep and wakefulness.

Temporal Patterns of Integrated Plasma Hormone Levels During Sleep and Wakefulness. II. Follicle-Stimulating Hormone, Luteinizing Hormone, Testosterone and Estradiol

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Randomized trial measures hormone levels in adults, indicating complex hormonal interactions during sleep.

This research examines the fluctuations in plasma levels of LH, FSH, testosterone, and estradiol during sleep and wakefulness.
Plasma concentrations of hormones measured in 4 healthy adults and 1 man over 48 hours.
Continuous blood sampling technique and polygraphic sleep recording utilized.
Assessment of correlations between hormone levels and sleep stages conducted.
LH and FSH levels showed oscillations, but one woman's LH fluctuations were infrequent.
Mean LH and FSH levels were higher while testosterone was lower on day two of the 48-hour study.
No consistent relationships were found between hormone levels and stages of sleep.

Alford et al. (1973) studied this question.

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