How Bedroom Temperature and Blue Light Affect Blood Sugar in Type 1 Diabetes

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 [https://yourbestt1dyear.com] Connect with Neil: TikTok: https://tiktok.com/@the.betes [https://tiktok.com/@the.betes] Instagram: https://instagram.com/thebetes [https://instagram.com/thebetes] Facebook: https://facebook.com/neilgreathouse [https://facebook.com/neilgreathouse] LinkedIn: https://linkedin.com/in/neil-greathouse-a607b912 [https://linkedin.com/in/neil-greathouse-a607b912] Website: https://yourbestt1dyear.com [https://yourbestt1dyear.com] Books on Amazon: Type 1 Diabetes – One Day at a Time: https://a.co/d/6UHooWJ [https://a.co/d/6UHooWJ] Type 1 Diabetes – True Stories: https://a.co/d/dfIlyI1 [https://a.co/d/dfIlyI1]

T1D Sleep Stages Explained: Why You're Exhausted After 7 Hours of Sleep

SHOW NOTES: You slept seven hours. By any reasonable measure, that should be enough. You woke up feeling like you slept four. You weren't imagining it. This episode breaks down sleep stages -- light sleep, deep sleep, REM -- and explains exactly where type 1 diabetes disrupts the sequence. The most important stage, slow-wave sleep (NREM Stage 3), is where your body does its deepest repair work: growth hormone release, cellular recovery, immune restocking, brain waste clearance. T1D adults get measurably less of it. Not because of anything you're doing wrong, but because T1D interrupts sleep architecture in ways that are documented in the research and that most T1D people were never told about. This is Week 6 of the While You Were Sleeping Challenge. This is the episode that explains WHY you're tired even when the hours were there. In this episode: * The 90-minute sleep cycle and what each stage actually does for your body * Why slow-wave sleep is the stage that matters most -- and why T1D adults get less of it * How every alarm, partial arousal, and cortisol spike sends your brain back to Level 1 * The difference between "not enough hours" and "disrupted sleep stages" -- they feel the same but aren't * How to check your deep sleep percentage if you have a wearable This Week's Challenge: If you have a wearable that tracks sleep stages, check last night's deep sleep percentage. The average for most adults is 15-20%. Just know your number. Helpful resources and newsletter: https://yourbestt1dyear.com [https://yourbestt1dyear.com] Connect with Neil: TikTok: https://tiktok.com/@the.betes [https://tiktok.com/@the.betes] Instagram: https://instagram.com/thebetes [https://instagram.com/thebetes] Facebook: https://facebook.com/neilgreathouse [https://facebook.com/neilgreathouse] LinkedIn: https://linkedin.com/in/neil-greathouse-a607b912 [https://linkedin.com/in/neil-greathouse-a607b912] Website: https://yourbestt1dyear.com [https://yourbestt1dyear.com] Books on Amazon: Type 1 Diabetes – One Day at a Time: https://a.co/d/6UHooWJ [https://a.co/d/6UHooWJ] Type 1 Diabetes – True Stories: https://a.co/d/dfIlyI1 [https://a.co/d/dfIlyI1]

Fear of Hypoglycemia: The T1D Sleep Problem That Doesn't Show Up in Your CGM Data

SHOW NOTES: Your CGM says 115. Flat arrow. No active insulin. You've checked it twice. The number is completely fine. And you're still awake at 2:48am. This is not you being dramatic. This has a name: Fear of Hypoglycemia (FOH). It's a documented, peer-reviewed phenomenon in T1D populations -- a specific pattern of nighttime hypervigilance that persists even when blood sugar is stable. The anxiety is the disruptor, independent of the actual glucose level. And it's one of the most undernamed contributors to T1D sleep disruption. In this episode, Neil explains where Fear of Hypoglycemia comes from, why it makes complete sense that it developed, and why having the name for it changes how you relate to the 2am wake-up. Nobody told most T1D people this name. That's the problem this episode is here to fix. We're in Week 6 of the While You Were Sleeping Challenge. In this episode: * What Fear of Hypoglycemia actually is and what peer-reviewed research says about it * Why the overnight hypervigilance response is a rational system with an irrational trigger * The difference between "I'm being irrational" and "I have a documented T1D sleep phenomenon" * Why naming FOH changes how you relate to being awake at 2am with a perfect number * What comes next: what you can actually do about it This Week's Challenge: Have you ever been awake at 2am with a completely stable blood sugar and still couldn't sleep? Just acknowledge that it happened. That's the whole challenge. Helpful resources and newsletter: https://yourbestt1dyear.com [https://yourbestt1dyear.com] Connect with Neil: TikTok: https://tiktok.com/@the.betes [https://tiktok.com/@the.betes] Instagram: https://instagram.com/thebetes [https://instagram.com/thebetes] Facebook: https://facebook.com/neilgreathouse [https://facebook.com/neilgreathouse] LinkedIn: https://linkedin.com/in/neil-greathouse-a607b912 [https://linkedin.com/in/neil-greathouse-a607b912] Website: https://yourbestt1dyear.com [https://yourbestt1dyear.com] Books on Amazon: Type 1 Diabetes – One Day at a Time: https://a.co/d/6UHooWJ [https://a.co/d/6UHooWJ] Type 1 Diabetes – True Stories: https://a.co/d/dfIlyI1 [https://a.co/d/dfIlyI1]

Cortisol and Blood Sugar: The T1D Overnight Connection You're Probably Missing

SHOW NOTES: Cortisol isn't trying to ruin your blood sugar. It's trying to help. It has never once, in your entire life, acted with malice. It is a useful, important hormone that is -- in the modern world -- very confused about what an actual emergency looks like. This episode is about cortisol: what it's designed to do, what it's actually responding to in modern life ("quick question" emails at 10pm), and what it's doing to your blood sugar by midnight. For T1D people, cortisol-driven blood sugar rises don't get quietly compensated by a functioning pancreas. They land. And they land on top of whatever else was already happening overnight. Understanding the cortisol loop is the first step to interrupting it -- starting with the hour before bed. We're in Week 6 of the While You Were Sleeping Challenge. Solutions are building. In this episode: * What cortisol is actually designed to do -- and why your lion never shows up * How cortisol raises blood sugar in T1D without the automatic pancreas feedback to catch it * The full cortisol loop: poor sleep raises cortisol, cortisol raises blood sugar, elevated blood sugar disrupts sleep * Why what you do in the hour before bed shows up in your midnight glucose * How to start rating your pre-bed stress and looking for the pattern in your own data This Week's Challenge: Rate your stress level 1-10 before bed, three nights this week. Note your morning blood sugar each time. Look for the pattern. Helpful resources and newsletter: https://yourbestt1dyear.com [https://yourbestt1dyear.com] Connect with Neil: TikTok: https://tiktok.com/@the.betes [https://tiktok.com/@the.betes] Instagram: https://instagram.com/thebetes [https://instagram.com/thebetes] Facebook: https://facebook.com/neilgreathouse [https://facebook.com/neilgreathouse] LinkedIn: https://linkedin.com/in/neil-greathouse-a607b912 [https://linkedin.com/in/neil-greathouse-a607b912] Website: https://yourbestt1dyear.com [https://yourbestt1dyear.com] Books on Amazon: Type 1 Diabetes – One Day at a Time: https://a.co/d/6UHooWJ [https://a.co/d/6UHooWJ] Type 1 Diabetes – True Stories: https://a.co/d/dfIlyI1 [https://a.co/d/dfIlyI1]

How Bedroom Temperature and Blue Light Affect Blood Sugar in Type 1 Diabetes

SHOW NOTES: Neil wants to be upfront: this episode is going to sound like wellness content delivered by someone standing in a field in linen pants. He knows. He can't control how it sounds. What he can tell you is that there's actual research behind all of it, it specifically applies to T1D glucose management, and he read most of it at midnight on his phone in bed with the screen at full brightness. Your sleep environment -- specifically temperature, light, and screen exposure -- directly affects the hormones that regulate both sleep and glucose. For T1D people, those hormones matter more because there's no backup system to compensate when they go sideways. Blue light at 10pm tells your brain it's daytime, suppresses melatonin, and raises cortisol. A warm room keeps your core temperature elevated, making it harder to drop into deep sleep. Both of these things are doing quiet work against your blood sugar while you're trying to rest. We're in Week 5 of the While You Were Sleeping Challenge. In this episode: * How blue light from screens suppresses melatonin and triggers cortisol at 10pm * Why your phone screen registers as "daytime" to your brain's sleep-wake system * Core body temperature and its role in reaching deep sleep stages * The research-backed temperature range for better sleep quality * One practical environmental change to make tonight that doesn't require buying anything This Week's Challenge: Know your bedroom temperature. Tonight, put your phone face down one hour before bed. Not in another room -- just face down. See what happens. Helpful resources and newsletter: https://yourbestt1dyear.com [https://yourbestt1dyear.com] Connect with Neil: TikTok: https://tiktok.com/@the.betes [https://tiktok.com/@the.betes] Instagram: https://instagram.com/thebetes [https://instagram.com/thebetes] Facebook: https://facebook.com/neilgreathouse [https://facebook.com/neilgreathouse] LinkedIn: https://linkedin.com/in/neil-greathouse-a607b912 [https://linkedin.com/in/neil-greathouse-a607b912] Website: https://yourbestt1dyear.com [https://yourbestt1dyear.com] Books on Amazon: Type 1 Diabetes – One Day at a Time: https://a.co/d/6UHooWJ [https://a.co/d/6UHooWJ] Type 1 Diabetes – True Stories: https://a.co/d/dfIlyI1 [https://a.co/d/dfIlyI1]