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The overnight window

Here’s what happens to glucose while you sleep, why it’s the hardest part to manage, and what the research reveals people actually do about it.

Most writing about diabetes is about the daytime, because that’s when you can act. These pages are about the other “eight” hours, when you can’t.

Everything here comes from published research or from a survey of 583 adults with diabetes that we commissioned. None of it is medical advice or recommendations about your own diabetes management. Please talk to your care team about your own circumstances.

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What is sleep-only automation?

It’s automated insulin delivery for people who use pens, only while they sleep. Here’s who it’s for and how it differs from a pump.

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The overnight hours

Going to bed high on purpose

Nearly a third of people deliberately run high at bedtime to avoid going low. Here’s why, and what it costs.

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Low blood sugar at night

People rank preventing overnight lows above everything else, even when lows are rare. Here's why.

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Why blood sugar can be high in the morning

The dawn phenomenon.

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Diabetes and sleep

Diabetes interrupts sleep for most people, but it rarely comes up with your doctor. Here’s why.

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Overnight time in range

Time in range can show you a bad night that an A1c averages away. Here’s what it measures.

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Your situation

Why most people on injections don’t use a pump

Most of the reasons people give for not using a pump are about living with one.

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Type 2 diabetes on basal-only insulin

Your morning reading is a report on the night, and a CGM can show you how the night went.

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Talking to your doctor about your nights

Here’s what to ask, so you can make your nights part of the conversation.

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Glossary

Here are quick definitions of A1c, basal insulin, CGM, time in range, and more.

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A new chapter for overnight

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