T1D Sleep Hygiene: The One Pre-Sleep Habit That Actually Makes a Difference
"Sleep hygiene" sounds like you're brushing your sleep's teeth. Nobody has ever said that phrase in a natural conversation. And this episode is not about a 12-step pre-sleep protocol that you'll implement on Monday and abandon by Wednesday...
The episode, word for word
You have been sleeping next to one of the most detailed health monitoring devices that exists.
Every night. For however long you've had your CGM.
It has been logging everything. Every rise, every drop, every time your blood sugar did the thing at 3am. Every trend. Every pattern. Every night that looked different from the night before.
It's been trying to tell you something. It has been incredibly patient about this.
My name is Neil Greathouse, and this is Your Best T1D Year.
All right. I want to talk about your overnight CGM data and why most of us have never actually looked at it.
Not the alarms. Not the morning number. The whole graph. The overnight graph. The shape of what your blood sugar was doing for the eight hours you were supposed to be sleeping.
Here's the thing. Most T1D people use their CGM reactively at night. The alarm fires, you check, you respond or you silence, you go back to sleep. The alarm is the use case. Alarm, check, action or not, back to sleep. Repeat.
What very few T1D people do is look at the whole overnight pattern proactively, not to respond to a single moment, but to see the shape of the whole night.
Your CGM is basically like having a personal trainer who has been logging every workout you've ever done, in perfect detail, every single day for two years, and you've never looked at the data. You've only looked at the notification that fires when something goes wrong. The trainer has been trying to show you the pattern. You've been silencing the notification and going back to sleep.
Think about it. Your overnight graph shows you whether the dawn phenomenon is happening and when it starts. It shows you whether post-exercise glucose drops are hitting you at 2am. It shows you whether your pre-sleep correction tailed off too hard at midnight or whether it barely moved the number. It shows you your cortisol spike. It shows you the pattern of your nights, laid out in a line, available any time you want to look at it.
The data was always there. It was on the device you sleep next to every night. And most of us have only ever opened it to respond to an alarm.
Here's what I want to reframe for you.
Your CGM graph is not a report card. I think we treat it like a report card. We look at it and feel good or bad about the shape of it. A flat line feels like an A. A lot of variability feels like something to apologize for.
It's not a report card. It's a map. You're a navigator, not a student. And a map that shows you where the rough water was last night is useful information for adjusting your route tonight.
Look at the map. Not the grade.
OK. Here's what I want you to do. Tonight, before you go to sleep, pull up your CGM app and look at the overnight graph from last night. The whole thing. Not the current number. The whole shape of what happened between when you went to sleep and when you woke up.
Do you see the dawn rise? Do you see a dip in the middle of the night? Is it relatively flat? Did something happen around 3am? When did the rise start, if there was one?
You don't have to do anything about it yet. You're just learning to read the map.
Tonight: look at last night's overnight CGM graph. The whole shape.
Not to judge it. Not to fix it. Just to see what was there.
One minute. One graph. That's it.
To the person who's been walking around with a detailed overnight dataset and never had reason to look at it.
The reason is right here. The data was always there. We're just looking at it differently now.
You're not doing a bad job. You're doing a difficult job, and you've had tools this whole time that we're just now learning to fully use. I'm proud of you.
Type 1 diabetes is relentless, but managing it doesn't have to be. New episodes every Monday, Wednesday, and Friday. You're not doing a bad job, you're doing a difficult job. Nobody remembers easy.
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.