Hormonal
Sleep restriction (4 hours/night) increases evening cortisol levels and delays the nocturnal nadir, while simultaneously decreasing TSH levels and amplitude, indicating a disruption of the hypothalamo-pituitary-adrenal and thyroid axes.
Short sleep doesn't just make you tired; it shifts your stress hormones (cortisol) to be higher in the evening and lowers thyroid-stimulating hormone (TSH). This hormonal imbalance contributes to metabolic stress. Prioritizing 8 hours of sleep helps normalize these rhythms.
Cortisol levels in the late afternoon and evening (1600-2100 h) were higher after sleep restriction... and the nadir occurred approximately 1.5 h later... After sleep restriction, mean 24-h TSH levels were 26% lower... and the amplitude of the diurnal variation was reduced by 27%.
Why this rating
Controlled crossover design with frequent sampling allows for precise chronobiological analysis.
Source
Leptin Levels Are Dependent on Sleep Duration: Relationships with Sympathovagal Balance, Carbohydrate Regulation, Cortisol, and Thyrotropin
Karine Spiegel et al. · The Journal of Clinical Endocrinology & Metabolism · 2004
DOI 10.1210/jc.2004-1003
More from this paper
- Restricting sleep duration to 4 hours per night for 6 days significantly decreases circulating leptin levels (mean -19%, maximal -26%) and reduces the amplitude of the diurnal leptin rhythm compared to extended sleep (12 hours).Good
- Sleep restriction (4 hours/night) impairs glucose tolerance and increases post-breakfast insulin resistance, as measured by elevated HOMA values, despite similar insulin levels to rested conditions.Good
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