Late-Night Exercise and Blood Sugar: What Your Evening Workout Does to Your T1D Overnight

SHOW NOTES:

Your Tuesday 8pm HIIT class has opinions about your 3am blood sugar. The data is pretty clear on this. Neil is giving you fair warning before the episode starts.

This episode covers the timing of exercise and its downstream effects on both sleep quality and overnight glucose in type 1 diabetes. Afternoon and evening exercise produce very different results -- not because exercise is bad for T1D management (it isn't), but because your core body temperature, cortisol rhythm, and post-exercise glucose patterns interact with your sleep in ways that depend heavily on when you moved. The 8pm workout can raise core temperature, spike cortisol, and set up a 2am glucose drop that fires an alarm -- all without any other mistake being made.

We're in Week 7 of the While You Were Sleeping Challenge.

In this episode:

Why afternoon exercise (roughly noon to 6pm) supports better sleep and overnight glucose stability
What high-intensity evening exercise does to core body temperature and cortisol levels
How post-exercise glucose drops in T1D can create 2-3am lows and trigger alarms
What to look for in your overnight CGM data on workout days vs. rest days
How even a modest timing shift can meaningfully change the overnight picture

This Week's Challenge: What time was your last workout? Pull up your overnight CGM from that night. Did anything look different than your non-workout nights?

Helpful resources and newsletter: https://yourbestt1dyear.com

Connect with Neil: TikTok: https://tiktok.com/@the.betes Instagram: https://instagram.com/thebetes Facebook: https://facebook.com/neilgreathouse LinkedIn: https://linkedin.com/in/neil-greathouse-a607b912 Website: https://yourbestt1dyear.com

Books on Amazon: Type 1 Diabetes – One Day at a Time: https://a.co/d/6UHooWJ Type 1 Diabetes – True Stories: https://a.co/d/dfIlyI1

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