Evening meals

Eat dinner 3–4 hours before bed if you can (at least 2–3), keep it moderate in size, and go easy on spice and fat if you get reflux. Most studies on food and sleep are small.

• Evidence: Weak
• Low effort
• Free
• Works: tonight

Why it matters

What and when you eat in the evening can affect how quickly you fall asleep and how often you wake. For timing alone, see late meals. This page covers what’s on the plate.

• Carbohydrates. In a crossover trial of 12 healthy young men, a high-glycemic-index rice meal (jasmine rice) eaten 4 hours before bed cut the time to fall asleep from 17.5 to 9 minutes compared with a low-GI rice meal. The same high-GI meal eaten 1 hour before bed was less effective (14.6 minutes). Nothing else about sleep changed [1]. The proposed reason is that carbs raise blood levels of tryptophan, which the body uses to make serotonin [1].
• Protein. A review of 20 studies found diets higher in protein were linked to better measured sleep, and diets higher in fiber and unsaturated fat and lower in saturated fat were linked to better sleep too [2].
• Tryptophan supplements. A meta-analysis that could pool only 4 studies found that tryptophan, especially 1 g or more a day, reduced time awake during the night but didn’t change other sleep measures [5]. That’s supplements, not food.
• Heavy, late, fatty meals. In 52 healthy adults, eating more fat and more calories at night was linked to worse sleep, especially in women [3]. In a survey of 793 students, eating within 3 hours of bed was linked to more waking in the night [4].
• Spicy food. In 6 young men, Tabasco sauce and mustard with dinner reduced deep sleep, increased time awake and raised body temperature in the first sleep cycle [7].
• Reflux. People who went to bed less than 3 hours after dinner had much higher odds of reflux disease than those who waited 4 hours or more [8].

How to do it

1. Eat dinner 3–4 hours before bed when you can. That’s the timing that worked best in the carb trial [1]. The minimum is 2–3 hours, the reflux guideline’s advice [9]; see late meals.
2. Include some carbohydrate, such as rice, potatoes, pasta or bread. A low-carb dinner isn’t wrong, but this is where the (small) evidence points [1].
3. Include a normal portion of protein, and favor fiber, vegetables and unsaturated fats [2]. For what to eat in general, see eatgood.now.
4. Keep the portion moderate. Very large or very fatty evening meals are linked to worse sleep [3].
5. If you get heartburn at night, avoid meals within 2–3 hours of bed, avoid your own trigger foods, and raise the head of your bed. These are the American College of Gastroenterology’s suggestions, though it rates the evidence as low [9]. Frequent heartburn is worth seeing a doctor about.
6. If you’re hungry later, a small snack is better than going to bed hungry. If you train in the evening, a protein drink before bed is reasonable [6].

Common mistakes

• Treating one study as a rule. The high-GI rice result comes from 12 men [1]. Try it; don’t force it.
• Expecting turkey or milk to knock you out. The tryptophan evidence is for supplements in a handful of studies [5].
• A big, spicy dinner right before bed. That combines the three things most linked to worse sleep and reflux [3][7][8].
• Swapping dinner for alcohol. See alcohol.

Effect on your sleep score

• Time to fall asleep: about 8.5 minutes faster after a high-GI dinner 4 hours before bed, in one small trial [1]. In 9 resistance-trained adults, 40 g of whey protein 30 minutes before bed, after a resistance training session, led to faster sleep onset, higher efficiency and more total sleep than a carbohydrate drink with the same calories. Casein didn’t differ from the carb drink [6].
• Wake-ups and efficiency: linked to eating close to bed [3][4] and to spicy food [7].
• Deep sleep: lower after a spicy dinner, in 6 men [7].
• Resting heart rate: Oura lists late meals as one cause of a high resting heart rate [10].
• HRV: no change after pre-bed protein in the whey trial [6]. We found no study measuring dinner size or timing against HRV in healthy adults with wearables.

How confident: low.

Evidence

Rated Weak. The trials are small: 12 men for carbs [1], 6 men for spicy food [7], 9 people for whey protein [6]. The meal-timing and fat data are observational, so they show links, not cause [3][4][8]. The tryptophan meta-analysis pooled only 4 studies [5]. The review of diet and measured sleep says longer studies of whole foods in everyday life are still needed [2]. The reflux advice is a guideline, but its evidence is rated low [9].

General information for healthy adults, not medical advice. If you have a sleep problem that lasts, read when to see a doctor. Sources checked 4 October 2026. Spot a mistake? Tell us.