Sleep and Diabetes

Pillows on a neatly made bed — Photo: JohnLEE Brothers via Wikimedia Commons (CC0). Image credits

Last reviewed: October 9, 2026 · Sources: CDC, NIH/NIDDK, American Diabetes Association

Sleep and blood glucose are closely linked. Poor or short sleep can make the body more resistant to insulin and raise blood glucose, while high or low blood glucose can disrupt sleep. People with diabetes are also more likely to have certain sleep disorders, such as sleep apnea and restless legs syndrome. This guide explains how sleep affects diabetes, common sleep problems, and practical steps to sleep better. Talk with your health care provider if you have ongoing sleep problems.

How much sleep do adults need?

Most adults need at least 7 hours of sleep per night. The NIH's National Heart, Lung, and Blood Institute explains the effects of sleep deprivation and deficiency, including links to chronic health problems such as diabetes, heart disease, and high blood pressure. Children and teens need more sleep than adults.

How poor sleep affects blood glucose

When you do not get enough sleep, several changes can make diabetes harder to manage:

Insulin resistance: Research has shown that sleep loss can make the body's cells less responsive to insulin, so blood glucose rises.
Stress hormones: Sleep deprivation can increase stress hormones such as cortisol, which raise blood glucose. See stress and blood sugar.
Appetite: Short sleep affects hormones that regulate hunger and fullness, which can increase appetite and cravings for high-carbohydrate foods.
Energy and motivation: Being tired makes it harder to exercise, prepare healthy meals, and keep up with diabetes care.

Over time, short or poor-quality sleep is associated with a higher risk of developing type 2 diabetes.

How diabetes affects sleep

High blood glucose can cause frequent nighttime urination and thirst, waking you up.
Low blood glucose during the night can cause nightmares, sweating, and waking with a headache or feeling tired. See hypoglycemia.
Nerve pain from diabetic neuropathy can be worse at night. See diabetic neuropathy.
CGM alarms can interrupt sleep, though they also help prevent dangerous overnight lows. Talk with your care team about appropriate alarm settings.
Stress and worry about diabetes can make it hard to fall asleep.

Sleep disorders linked with diabetes

Obstructive sleep apnea

In obstructive sleep apnea, the airway repeatedly becomes blocked during sleep, causing pauses in breathing. It is common in people with type 2 diabetes, especially those with overweight. Signs include:

Loud snoring
Pauses in breathing or gasping during sleep, often noticed by a bed partner
Waking with a dry mouth or headache
Daytime sleepiness, even after a full night in bed
Trouble concentrating

Untreated sleep apnea is linked with high blood pressure, heart disease, and worse glucose levels. It is diagnosed with a sleep study, which may be done at home or in a sleep lab. Treatment may include continuous positive airway pressure (CPAP), oral appliances, weight loss, and other options. If you have symptoms, tell your provider. See weight and diabetes and heart health.

Restless legs syndrome

Restless legs syndrome causes an uncomfortable urge to move the legs, usually in the evening or at night, which can make it hard to fall asleep. It may be more common in people with diabetes. Low iron levels and kidney disease can contribute. Treatments are available, so mention symptoms to your provider.

Insomnia

Insomnia means trouble falling asleep, staying asleep, or waking too early. Stress, depression, pain, nighttime urination, and caffeine can all contribute. Cognitive behavioral therapy for insomnia (CBT-I) is a well-studied, non-medicine treatment that helps many people.

Tips for better sleep

MedlinePlus offers guidance on healthy sleep. Helpful habits include:

Keep a regular schedule. Go to bed and wake up at the same times every day, including weekends.
Create a restful bedroom. Keep it dark, quiet, and cool. Use the bed only for sleep and intimacy.
Limit screens before bed. Light from phones, tablets, and TVs can interfere with sleep. Try to stop using them about an hour before bed.
Watch caffeine. Avoid caffeine in the afternoon and evening.
Limit alcohol. Alcohol may make you drowsy but disrupts sleep later in the night and can cause overnight lows. See alcohol and diabetes.
Avoid large meals late at night. A heavy meal close to bedtime can cause discomfort and higher overnight glucose.
Be active during the day. Regular physical activity improves sleep quality, but very vigorous exercise close to bedtime may make it harder to fall asleep for some people. See exercise and diabetes.
Get daylight. Exposure to natural light during the day helps regulate your body clock.
Wind down. A relaxing routine, such as reading, gentle stretching, or a warm shower, can signal your body that it is time to sleep.
Don't lie awake for long. If you cannot sleep after about 20 minutes, get up and do something calm in dim light until you feel sleepy.

Managing glucose overnight

Check before bed. Know your bedtime glucose. Your care team can tell you what range is safe for you overnight.
Prevent overnight lows. If you take insulin or medicines that can cause lows, ask whether you need a bedtime snack, especially after exercise or alcohol. CGM low alerts can help.
Address overnight highs. Persistent high overnight or morning readings may need treatment adjustments. See the dawn phenomenon.
Use technology wisely. Automated insulin delivery systems can adjust insulin overnight for some people with type 1 diabetes. See insulin basics.
Treat nerve pain. Effective treatment of painful neuropathy can improve sleep.

Shift work

Working night or rotating shifts disrupts the body's internal clock and is associated with higher risk of type 2 diabetes and difficulty managing glucose. If you work shifts, try to keep a consistent sleep schedule on work days, make your sleep environment dark and quiet during the day, plan meals and medicines with your care team around your schedule, and check glucose regularly.

When to see your provider

Talk with your provider if you:

Snore loudly or someone notices pauses in your breathing
Feel very sleepy during the day
Have trouble falling or staying asleep for several weeks
Have frequent overnight lows or highs
Have leg discomfort or pain that keeps you awake
Feel depressed or anxious

Frequently asked questions

Can a nap make up for poor sleep?

A short nap of about 20 to 30 minutes can help with daytime sleepiness, but it doesn't fully make up for a lack of regular nighttime sleep. Long or late-day naps can make it harder to fall asleep at night.

Do sleep medicines affect blood glucose?

Some medicines can affect glucose or make it harder to notice a low during the night. Talk with your provider before taking prescription or over-the-counter sleep aids, and consider non-medicine approaches such as CBT for insomnia first.

Can treating sleep apnea improve my diabetes?

Treating sleep apnea improves sleep quality, daytime alertness, and blood pressure for many people, and may help some people with glucose management. It is worth getting evaluated if you have symptoms.

Key takeaways

Most adults need at least 7 hours of sleep; short or poor sleep can raise insulin resistance and blood glucose.
High and low glucose, nerve pain, and nighttime urination can disrupt sleep.
Sleep apnea is common in type 2 diabetes and should be evaluated if you snore loudly or are sleepy during the day.
A regular schedule, a restful bedroom, and limiting screens, caffeine, and alcohol support better sleep.

Sources

Links to the sources cited above appear in the text. We rely on the Centers for Disease Control and Prevention (CDC), the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), and the American Diabetes Association (ADA).

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