Research digest — not medical advice. Full disclaimer · How we rate evidence
Exercise Timing
Move early, sleep early
Overview
Avoiding vigorous exercise within 3 hours of bedtime. Exercise raises core body temperature and sympathetic tone — both need to come down for sleep onset.
How it works
Exercise raises cortisol and core body temperature. Core temperature must drop by roughly 1°C to initiate sleep.
Benefits
Body temperature: allows core temp to drop in the hours before bed.
B
Protocol
- 1Aim to finish vigorous workouts by 6–7pm if you sleep at 10pm.
- 2Light walking, yoga, or stretching is fine closer to bed.
- 3If evenings are your only window, keep the workout moderate and finish with a cooldown.
Safety Profile
Research Summary
Mixed evidence — some people tolerate late exercise well, but the general direction of the literature favours earlier sessions.
Sources
Last updated: 2026-04-10
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Medical Disclaimer
This is a research summary, not medical advice. Body Signals is an independent research digest — it summarises published research for informational purposes and is not a healthcare provider. Supplements like melatonin, valerian, and magnesium can interact with prescription medications — check with your doctor or pharmacist before starting any supplement. Chronic insomnia may indicate an underlying condition (sleep apnoea, thyroid dysfunction, depression) and warrants a medical evaluation.
Need professional guidance?
If sleep issues persist despite lifestyle changes, a sleep specialist or your family doctor can help rule out underlying conditions.
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