SHOW NOTES:

You went to bed at a perfect 110. No active insulin. Flat arrow. You did everything right. You wake up at 182. Nothing happened -- no low, no alarm. You just slept. Except something did happen. You just weren't awake for it.

This episode introduces the dawn phenomenon: the pre-dawn hormonal surge (cortisol, growth hormone, glucagon, epinephrine) that causes your liver to manufacture and release glucose into your bloodstream between roughly 3am and 8am, every single night, without your permission. For people without T1D, the pancreas handles this automatically and they never know it happened. For T1D people, the glucose just lands -- and then we stand in the kitchen at 6am holding an insulin vial up to the light, wondering what on earth went wrong.

This is Week 3 of the While You Were Sleeping Challenge. We're getting into actual mechanisms.

In this episode:

• What the dawn phenomenon actually is and what triggers it
• Hepatic glucose output explained in plain English (and why it sounds like a Jurassic Park sequel)
• Why non-T1D people never notice this happening overnight
• What 34 years of blaming the insulin vial actually looked like
• How to start spotting the dawn phenomenon in your own overnight CGM data

This Week's Challenge: Pull up your overnight CGM graph from last night. Do you see a gradual rise starting around 3 or 4am when your blood sugar was otherwise flat? Just look. Don't change anything yet.

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

SHOW NOTES:

Sleep deprivation reduces insulin sensitivity in everyone. That's not a T1D-specific finding. Here's what is.

In people without diabetes, the system has a feedback loop. Insulin sensitivity drops, blood sugar ticks up slightly, the pancreas compensates automatically, and the whole thing resolves before they're even awake. They make coffee, go about their day, and have no idea any of it happened. For T1D people, that feedback loop doesn't exist. The penalty just lands.

This episode explains why the same sleep deprivation hits harder when you don't have a functioning pancreas to compensate -- and why T1D people have been quietly doing the backup system's job manually every single morning, often without realizing that's what they were doing.

We're in Week 2 of the While You Were Sleeping Challenge.

In this episode:

• How a healthy pancreas automatically compensates for sleep-related insulin sensitivity changes
• Why the T1D body absorbs the full 21% impact without automatic correction
• What "doing the backup system's job manually" actually looks like before the first cup of coffee
• The emotional reality of running on interrupted sleep while managing blood sugar
• What to add to your data tracking this week

This Week's Challenge: On mornings after rough nights, notice if you had to work harder -- more corrections, more frustration, numbers that were less predictable. That's the 21% showing up in real life.

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

SHOW NOTES:

Here's the number: 21%.

One study. People with type 1 diabetes. Sleep-deprived condition (4 hours) versus adequate sleep (8.5 hours). Same food, same insulin, same activities. The sleep-deprived group showed a 21% reduction in insulin sensitivity the next day. Every single participant.

This is the episode Neil has been building toward. If you've ever had a day where your insulin felt slow -- where corrections didn't land, where you corrected twice before breakfast and were still running higher than expected -- this episode gives you a name for what was happening. And it changes how you respond to those mornings going forward.

This is Week 2 of the While You Were Sleeping Challenge. This is the research drop.

In this episode:

• The specific study on sleep and insulin sensitivity in type 1 diabetes -- and what it actually showed
• What a 21% reduction in insulin sensitivity looks like in real life (the bathtub analogy)
• Why the effect showed up in every single participant, not just some
• What LeBron James figured out about sleep that the rest of us are just now learning
• How to use this information to give yourself grace on mornings after rough nights

This Week's Challenge: Look back at your data from Week 1. On the mornings after your worst nights of sleep, did your insulin feel different? Did corrections land differently?

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