A DIETITIAN SHARES 7 HABITS THAT CAN CAUSE NIGHTTIME BLOOD SUGAR FLUCTUATIONS

Medically reviewed by Aviv Joshua, MS, RDN

Blood sugar naturally shifts throughout the day, including at night. For people with diabetes, it can also rise or drop too low. Certain evening habits can increase this risk, but making small changes can help prevent these fluctuations.

1. Skipping Meals or Eating at Irregular Times

Skipping meals puts you at greater risk for hypoglycemia (low blood sugar). People with diabetes should plan on eating meals at consistent times each day so that medications can be dosed based on those meals.

It is generally recommended to eat dinner three to four hours before going to bed. Food quality also matters—try to eat a combination of complex carbs, protein, and healthy fats.

2. Drinking Alcohol at Night

Having a late drink could be a culprit in overnight blood sugar drops. Alcohol tends to lead to blood sugar drops several hours later. Drinking on an empty stomach puts you at even greater risk.

If you are having the occasional drink, pair it with some complex carbs to help prevent that overnight drop in blood sugar.

3. Eating Too Much or Too Late

Eating a large dinner or snacking too close to bedtime can cause a rise in blood sugar that may last all night, especially if the snack is high in simple carbs.

Aim to finish eating a few hours before bed. In some cases, you may need a bedtime snack, but these should be carefully planned along with your medication regimen.

4. Not Fueling Around Evening Exercise

While a light walk after dinner can be a good way to lower blood sugar before bedtime, it can affect your levels for hours afterwards. In some cases, it can put you at risk for low blood sugar overnight, especially if you are exercising more intensely than usual.

You may want to have a snack before or after exercising to help keep your blood sugar balanced. Checking your levels before going to bed can also help prevent overnight lows.

5. Overcorrecting Low Blood Sugar Before Bed

If your blood sugar drops too low just before bedtime, don't overcorrect with a lot of simple carbs. This could raise your blood sugar too much.

Remember the rule of 15s for correcting low blood sugar:

• Consume 15 grams of carbohydrate (often 4 oz of orange juice or equivalent).
• Wait 15 minutes and check your blood sugar.
• Repeat until your blood sugar is over 70 mg/dl.

6. Choosing Foods That Spike Blood Sugar

Eating a healthy diet is essential to managing blood sugar, especially if you have diabetes:

• Choose foods lower in added sugars, saturated fat, and sodium.
• Include protein and fiber at dinner to help balance blood sugar.
• Control portion sizes and follow the plate method, which helps you create a healthy, balanced meal.

7. Missing Medication Doses

If you have diabetes, missing medication doses or not dosing enough insulin can lead to high blood sugar.

If your blood sugar is normal at bedtime, but is high when you wake up, you may need make adjustments to your medication regimen. Talk to your healthcare provider about your medication dose and schedule.

How to Manage Blood Sugar Overnight

People with diabetes need to frequently check their blood sugar levels throughout the day. Continuous blood glucose monitors (CGMs) can be a useful tool for monitoring patterns and factors that affect blood sugar levels.

Check your blood sugar level before going to bed. If your blood sugar is low, a snack of complex carbs may help bring it back up so you can prevent extreme lows overnight.

A blood sugar that is too low is typically considered less than 70 milligrams (mg)/deciliter (dl).

Keep an eye out for symptoms of hypoglycemia and hyperglycemia. Symptoms of hypoglycemia may include:

• Shakiness
• Irritability
• Confusion
• Tachycardia (fast heart rate)
• Sweating

Symptoms of hyperglycemia may include:

• Feeling more hungry than usual
• Drowsiness
• Blurred vision
• Dry mouth or feeling very thirsty
• Waking up to urinate

Paying attention to your evening habits and checking your blood sugar before bed can help you keep your levels stable.

Managing Blood Sugar With Diabetes

If you've been newly diagnosed with diabetes, you'll need to learn how to manage your blood sugar levels daily. Work with your care team, as they can counsel on diet, medication, and how to correctly monitor your blood sugar.

Read the original article on Verywell Health

2026-05-12T18:02:58Z