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Diabetes & sleep

Low blood sugar at night

Overnight lows dominate how people think about the night, even when they happen rarely. Here’s why.

A woman asleep in bed beside a nightstand with a small plant

It is the risk you cannot answer

Ask people with diabetes what matters most about overnight and morning glucose, and preventing lows comes first, ahead of everything else.1

The reason isn’t frequency. It’s that a low at three in the morning is the event you are least equipped to respond to. Awake, you feel it, or you see an alert and act. Asleep, both of these are less reliable.

Even the near misses cost you

79% of adults with type 1 diabetes on multiple daily injections and CGM say something diabetes-related interrupts their sleep occasionally or more often in a typical week, and low-glucose alarms are among the most common causes.2

An alarm that wakes you and turns out to be nothing still interrupts your night. Repeat that across a week, and it impacts your life.

The workaround has a price

One common strategy is to build in a buffer: go to bed higher than you would otherwise choose. 31% of people with diabetes say they do this deliberately.3

The survey does not establish whether this prevents lows. It can also mean the hours after are spent above range, and it often means waking up high. People are trading one problem for another.

More on going to bed high

Talk to your care team

This page describes what research found. If overnight lows are shaping how you manage, tell your care team directly.

Sources

  1. dQ&A, PWD Survey Results: Luna Patient Segmentation & Jobs To Be Done, January 2026, n=583, slides 59 and 60.
  2. dQ&A, PWD Survey Results: Luna Patient Segmentation & Jobs To Be Done, January 2026 (fieldwork 13–19 December 2025), slide 53; adults with type 1 diabetes on multiple daily injections and CGM, n=219; diabetes-related interruption occasionally or more often in a typical week.
  3. dQ&A, PWD Survey Results: Luna Patient Segmentation & Jobs To Be Done, January 2026 (fieldwork 13–19 December 2025), slide 51; n=583 US adults using insulin and CGM. Purposefully going to bed high to guard against overnight lows; self-reported attitudes, not outcomes.
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