If your blood sugar drops below 70 mg/dL at night, you need 15 grams of fast-acting carbohydrates right away. That’s the immediate fix. But the bigger question for most people is how to treat a nighttime low safely, get back to sleep, and prevent it from happening again. Here’s what works for both.
What to Eat Right Now: The 15-15 Rule
The standard protocol for treating low blood sugar is simple: eat 15 grams of fast-acting carbs, wait 15 minutes, then check your blood sugar again. If it’s still below 70 mg/dL, repeat with another 15 grams. Keep going until you’re back in your target range.
Good options to keep on your nightstand or nearby:
- Glucose tablets (the fastest, most predictable option, usually 4 grams each, so take 3-4)
- 4 ounces of juice (apple or orange, not a large glass)
- A tablespoon of honey
- Regular soda (about half a can, not diet)
- Hard candies (check the label for carb count)
Avoid chocolate, cookies, or ice cream as your first treatment. The fat in these foods slows down sugar absorption, which means your blood sugar takes longer to rise when you need it to come up quickly.
The Follow-Up Snack That Keeps You Stable
Once your blood sugar is back above 70 mg/dL, you’re not done. Fast-acting carbs burn off quickly, and without a follow-up snack, your levels can drop again while you sleep. This is where protein and fat come in. Eat a small balanced snack that combines a slow-digesting carbohydrate with protein or healthy fat to keep your glucose steady through the rest of the night.
Solid follow-up options include:
- A tablespoon of peanut butter with a few crackers
- A light cheese stick
- A hard-boiled egg with a small piece of toast
- Greek yogurt
- A small handful of nuts with a piece of fruit
The protein and fat slow the release of glucose into your bloodstream, creating a more gradual energy supply that lasts for hours instead of minutes. This is especially important at night because you won’t be awake to catch another drop.
How to Tell Your Sugar Is Low While Sleeping
The tricky part about nighttime lows is that you’re asleep when they happen. Some people wake up from symptoms, but many sleep right through a mild episode and only notice the aftereffects in the morning.
Signs that your blood sugar dropped during the night include waking up with damp or sweaty sheets, having vivid nightmares or unusually restless sleep, morning headaches, and feeling exhausted or groggy despite sleeping a full night. A bed partner might notice trembling, shaking, rapid breathing, or skin that feels hot and clammy. If any of these are happening regularly, it’s worth checking your blood sugar at 2 or 3 a.m. for a few nights to see what’s going on.
Blood sugar below 70 mg/dL is classified as level 1 hypoglycemia. Below 54 mg/dL is level 2 and more dangerous. Level 3 is any episode severe enough that you need someone else’s help to treat it, regardless of the number on your meter.
Bedtime Snacks That Prevent Nighttime Lows
If you’re prone to overnight drops, what you eat before bed matters more than what you eat during an episode. The goal is to go to sleep with a slow, steady source of fuel that your body can draw on for hours. A high-protein or high-fiber snack before bed is the best preventive strategy.
The Mayo Clinic recommends options like Greek yogurt, a tablespoon of peanut butter with celery, a hard-boiled egg, a light cheese stick, or salad greens with cucumber and a bit of oil and vinegar. These are all low-carb and high in protein or fiber, which means they won’t spike your blood sugar before bed but will provide a slow release of energy overnight.
Avoid large carb-heavy snacks right before sleep. A bowl of cereal or a few slices of bread can cause a spike followed by a crash, which is exactly what you’re trying to prevent. If you do include carbs, pair them with something that slows digestion: cheese and crackers rather than crackers alone, or an apple with peanut butter rather than an apple by itself.
Why Alcohol Makes Nighttime Lows Worse
Drinking in the evening is one of the most common and least recognized triggers for overnight low blood sugar. Alcohol interferes with your liver’s ability to release stored glucose into your bloodstream, a process called gluconeogenesis. Your liver is your main safety net against low blood sugar overnight, and alcohol essentially takes it offline.
Research shows that combining alcohol with carbohydrates (like beer, cocktails with mixers, or drinking while eating) actually increases the risk of a rebound low compared to eating carbs alone. In one study, hypoglycemia occurred significantly more often when participants consumed alcohol alongside glucose than when they consumed glucose by itself. The effect can last for hours after your last drink, which means the danger window overlaps with your sleep.
If you drink in the evening, eat a substantial snack with protein and complex carbs before bed, check your blood sugar before sleeping, and set an alarm to check again around 3 a.m. if you’re on insulin.
Morning Highs After Nighttime Lows
Some people treat a nighttime low, go back to sleep, and wake up with blood sugar that’s unusually high. This can happen through two different mechanisms. The first, sometimes called the Somogyi effect, occurs when your body overcorrects a low by flooding your system with stress hormones that push glucose up. The second, the dawn phenomenon, happens when your body naturally reduces insulin activity in the early morning hours as other hormones rise. Both lead to high morning readings, but the causes and solutions are different.
If your morning highs follow a nighttime low, the issue is likely rebound from overtreating or your body’s own correction response. Sticking to the 15-15 rule (rather than raiding the kitchen in a panic at 2 a.m.) helps prevent this overcorrection. If your morning highs happen without a preceding low, the dawn phenomenon is more likely, and the solution involves adjusting the timing or type of your medication rather than changing what you eat.
Using a Continuous Glucose Monitor at Night
A continuous glucose monitor can catch drops before they become dangerous. These devices check your glucose every few minutes and can sound an alarm when levels fall below a threshold you set. Research in the Journal of Diabetes Science and Technology found that CGMs reduce the number of nighttime low episodes through alarms, trend arrows, and pattern recognition.
One practical issue: these devices sometimes misread during sleep. Lying on the sensor can compress it against tissue and create a false low reading, with glucose appearing to drop by an average of 24 mg/dL for about 45 minutes. If your CGM wakes you with an alarm, confirm with a fingerstick before treating. Otherwise, you risk eating unnecessary carbs and ending up with high blood sugar by morning.
For people who use an insulin pump paired with a CGM, newer systems can automatically reduce or suspend insulin delivery when they predict a low is coming. This combination is currently the most effective technology for preventing nighttime episodes without requiring you to wake up and eat.
What to Keep on Your Nightstand
Preparation is half the battle with nighttime lows. When you’re groggy and shaky at 2 a.m., you don’t want to be fumbling through kitchen cabinets. Keep a small kit within arm’s reach: glucose tablets or a juice box for fast treatment, a few crackers with individual peanut butter packets for the follow-up snack, and your blood glucose meter. Glucose tablets are ideal because they’re pre-measured, don’t spoil, and won’t tempt you into overtreating the way a bag of candy might.