Why People with T1D Can't Sleep Through the Night
When's the last time you actually slept through the night? No CGM alarms. No blood sugar math at 3am. No lying awake wondering if your number was stable. If you can't remember, that's exactly the point. In this episode, Neil digs into...
The episode, word for word
Let me give you a scenario.
Tuesday night. You go to bed at a solid 112. Trend arrow flat. No active insulin. You did the thing. You wake up Wednesday morning at 218.
And you go through the list. Did you overtreat a low at some point? No. Did you eat something weird before bed? No. Bad pump site? Looks fine. Did you just somehow absorb less insulin for no reason?
Here's the question I want you to sit with.
What time did you go to bed Monday night?
My name is Neil Greathouse, and this is Your Best T1D Year.
OK. So far this week, we've established two things.
One: T1D makes sleeping harder in specific, documented ways that most of us were never told about.
Two: most of us have been awake at 3am more than we'd like to admit, and we've been either blaming ourselves or just white-knuckling through it and getting on with our day.
Today I want to connect sleep to blood sugar. Not in a vague, general "stress affects glucose" kind of way. In a very specific, directional way.
Sleep and blood sugar have a two-way relationship. Your blood sugar affects your sleep, and your sleep affects your blood sugar. And the second half of that sentence is the one that T1D content doesn't talk about enough.
We spend a lot of time learning how to manage blood sugar during the day. Meal bolusing, correction factors, activity adjustments, all of it. That's right, we should know that stuff. But we've basically been going to sleep every night without understanding what sleep is doing to the system we just spent all day managing.
OK. So. Here's what the research is starting to show.
When you don't sleep well, your body's ability to respond to insulin changes. That is a real, measurable, documented thing that happens in your physiology. Not subtly. I'm going to give you the specific number next week. I want you to have a week of your own data sitting next to it when it arrives, because I think it's going to land differently that way.
But for right now, I just need you to know: the connection is real, the research exists, and the number is not subtle.
What I want you to understand today is this. That mystery blood sugar on Wednesday morning? The one where you went to bed at 112 and woke up at 218? It might not have been about Monday's dinner. It might not have been about your pump site. It might have been about what time you went to sleep Sunday night.
And that changes what you do about it.
Here's why. If the problem is the pump site, you change the site. If the problem is the bolus timing, you adjust the timing. If the problem is sleep, and you don't know sleep is a variable, you just... blame yourself. You go through the checklist, come up empty, feel vaguely guilty about a number that had a completely different cause.
I've done that. For years. I've stood in my kitchen holding a vial of insulin up to the light like that was going to tell me something. I've blamed food from six hours ago. I've blamed the NBA playoffs, somehow. I've blamed things that were not the problem, because I was solving the right puzzle with the wrong set of clues.
The missing clue was right there the whole time. Eight hours long. I was just supposed to be asleep for it.
We're putting sleep on the checklist. Starting now.
Keep writing down these two things... sleep hours on one side, morning blood sugar on the other. Keep building that picture.
Today's add: when you write down your sleep, also note how your blood sugar felt to manage the next morning. Did it feel predictable? Did your corrections land where you expected them to? Did you have to work harder than usual?
You don't need to draw conclusions yet. I'll help you make sense of it as we go.
I want to say something to the person who's been putting T1D management on a scale and finding themselves coming up short. The one who knows every variable and still can't figure out why Wednesday was terrible.
You've been solving a puzzle with a bunch of pieces missing. That's not failure. That's just incomplete information.
We're adding a piece. And I think it matters more than you'd expect.
Type 1 diabetes is relentless. And I genuinely believe that managing it is about to get a little less confusing for some of you. I'm proud of you.
This is the script as read on the mic, lightly tidied for reading. Education, not medical advice. Talk to your care team before you change anything about your insulin.