“Evening Storm in the Stomach”: How Circadian Rhythms, Stress, and Microflora Create Discomfort

Many people are familiar with this feeling: during the day the body behaves quite calmly, but as soon as evening approaches, the stomach starts to beep. Bloating, rumbling, heaviness, tingling or even pain become part of the evening scenario. It is unpleasant. And this is not just a reaction to dinner, informs Ukr.Media.

Often, this condition is a result of factors accumulated during the day, which coincide with natural changes in the body. This discomfort can not only spoil the evening, but also affect the quality of sleep, creating a vicious circle: sleep disturbance increases stress and worsens intestinal disorders. Therefore, understanding the underlying causes of this condition is an important step towards its relief.

When the body is getting ready for sleep, and we ask it to digest dinner

The digestive system lives according to a daily rhythm. In the morning, its activity is higher: digestive juices are secreted more intensively, peristalsis works better, food moves more efficiently. But closer to the evening, everything changes. The body prepares for sleep – metabolism decreases, hormonal levels change, and the intestine works less actively:

Motor activity slows down. Wave-like bowel movements become less frequent. If a large or difficult-to-digest portion is ingested during this period, it remains in the stomach or small intestine longer — with an increased load and a chance for fermentation of the remains.

The secretion of enzymes and acids decreases. This makes it especially difficult to break down proteins and fats. They pass through the digestive tract partially undigested and become “fuel” for bacteria in the large intestine.

Hormonal shifts. Melatonin levels increase — and in addition to regulating sleep, it slows down intestinal motility. Cortisol levels decrease — and with it the tone of the entire system decreases.

The microbiome becomes more active. At night, the composition of active bacteria changes. Those responsible for fermentation begin to work more intensively, especially if there is a “substrate” – undigested food residues.

All this creates the prerequisites for the so-called digestive system overload syndrome: we give it a difficult task when it is already entering rest mode.

Practical advice: it is advisable to finish your main meal 3-4 hours before bedtime. This will allow the system to process food before its nightly slowdown begins. If you fall asleep at 11, the approximate dinner time is by 7:30 p.m.

Stress doesn't go away — it accumulates and manifests itself in the body.

What happens in the mind during the day does not remain “in the head.” The brain-gut axis is a real two-way connection. The psycho-emotional state directly affects the digestive system:

Stress hormones and neurotransmitters (particularly serotonin, which is produced in large quantities in the gut) alter both the tone of the intestinal muscles and their sensitivity. Under stress, motility can be either too fast (spasms) or too slow (stagnation).

Hypersensitivity. If you have accumulated tension during the day, your intestines may become more sensitive to even minor gas formation in the evening. This is not a fiction – it is a change in the pain threshold.

Focus on the body. All day long we often ignore the body's signals because we are busy. And in the evening we rest, relax and start to listen more. Yes, a little discomfort is felt more strongly.

Practical tip: Integrate short breaks for breathing exercises into your daily routine. Even 2-3 minutes of diaphragmatic breathing a few times a day will help reduce overall stress levels. And in the evening, create a calming ritual (music, a bath, reading without screens) that will help you “let go” of the day.

Food: not just “what” but also “when”, “with what” and “how” you eat

It's not just the quality of the products that matters. In the evening, a few more nuances become important:

Composition and combinations. Foods that are difficult to digest—for example, protein combined with lots of raw vegetables, or legumes, cabbage, apples—can leave behind a lot of undigested residue. This is especially problematic in the evening.

Fermentable carbohydrates. Fruits, sweets, products with sugar substitutes – all of these become food for bacteria if they get into them during their activity. Gas formation is a consequence of their fermentation work.

Food temperature. Food that is too hot or cold is an additional irritant to the nerve endings in the stomach. This can cause spasms in the evening.

Hydration and air. Not drinking enough fluids throughout the day or drinking too much water with your meals can dilute your digestive juices. Also, chewing gum, talking while eating, and drinking through a straw can all contribute to swallowing air, which can later cause bloating.

Practical advice: for dinner, choose stewed or boiled vegetables, a small portion of protein (fish, egg, poultry), and some grains. Eat slowly, without gadgets, and with concentration. And remember, less doesn't mean worse.

Movement is not only about the figure, but also about digestion

We are used to considering physical activity as a way to expend energy. But for the digestive tract, it is also a way of stimulation:

Lack of movement means the absence of the gentle massage of internal organs that occurs during walking or exercise. This slows down peristalsis.

Body posture. Prolonged sitting, slouching, and then lying down after eating disrupts intra-abdominal pressure. Gas is retained and food moves more slowly.

Practical advice: if your job is sedentary, get up every hour and walk for at least 2-3 minutes. After dinner, a 15-20 minute walk can be a better medicine than any pills. Ideally, add light exercises for the abdomen and lower back (for example, “cat-cow”, knees to chest).

A comprehensive approach: don't treat the symptom, but support the system

To make the evenings easier, you need consistent support. Not a fight, but care:

Listen to your body: keep a diary — food, mood, symptoms. You will be able to notice your own patterns.

Adjust your schedule: Not only should dinner be lighter. The entire day should be structured to take into account the evening load on the body.

Reduce stress: both during the day and in the evening. It's not just meditation — it's the right not to have time for everything, to delegate, to stop.

Take care of your microbiome: nutrition, probiotics (as prescribed), sleep patterns — everything matters.

Move: not for calories, but for peristalsis.

Sleep: quality sleep is not a bonus, but the basis for regulating all systems, including digestion.

If the discomfort recurs frequently, is accompanied by pain, weight loss, changes in bowel habits, or other symptoms, consult a doctor. This may be a manifestation of a functional disorder that should be confirmed and treated under supervision. A dietitian will help you adapt your diet to your needs.

Return to evening calm

The body is not the enemy. It does not protest, but reports. Sometimes a little grumbling, but honestly. If you listen to it, observe it, support it, evenings can become much calmer. And sleep can be deeper. Because true comfort does not begin with a list of “what not to eat”, but with respect for your rhythm, vulnerability and needs.

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