What a good night's sleep does to your bloodwork
Two weeks of short nights move glucose, cortisol and testosterone enough to change how a panel reads.
Dr. Marcus Bell
7 min read
Sleep is not a lifestyle footnote to your results — it is one of the inputs. Restrict healthy adults to five hours for a week and their insulin sensitivity drops measurably, which is why we ask about your sleep before interpreting a metabolic panel.
What moves, and how fast
Evening cortisol rises, morning testosterone falls, fasting glucose creeps up, and inflammatory markers tick higher. None of it is permanent, and most of it reverses within a fortnight of consistent nights.
Before you blame a marker
If you drew blood after a bad month, say so. We would rather note the context and retest than start treating a number that was really a symptom of a deadline.
Where sleep itself is the problem, the Sleep & Stress panel maps the hormones behind it rather than guessing.
Dr. Marcus Bell
Longevity medicine, Lubrix
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