10/21/2026
Your entire physiology runs on a 24-hour cycle, and that includes far more than when you feel sleepy.
Alertness has a peak and a trough. Growth hormone has a peak and a trough. Nearly everything in the body oscillates on a daily rhythm, down to things you wouldn’t expect.
There’s now enough evidence to ask a question that sounds almost strange at first: what time of day should a specific person receive a specific chemotherapy agent, so that it works best for them. Not a general guideline. An answer tailored to that individual’s own rhythm.
Once you start looking at circadian biology this way, it stops feeling like a sleep topic. It starts feeling like a new dimension of medicine that’s barely been explored yet.