Miya Pearson
Sleep and digestion are closely linked. While the body is asleep, the digestive system continues to work, but at a much slower rate. This is because the body is not consuming any more food or drink. During sleep, the body repairs and grows digestive tissues, fuelled by glucose from earlier meals. However, eating a large meal too close to bedtime can disrupt this process, leading to issues such as heartburn, indigestion, and acid reflux, which can cause sleep disturbances. The bidirectional relationship between sleep and digestion means that a lack of sleep can also negatively impact the digestive system, for example by influencing appetite and changing the release of hunger and fullness hormones.
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What You'll Learn
- Digestion continues during sleep, but at a slower pace
- Poor sleep can disrupt digestion, causing indigestion and acid reflux
- The right lateral position during sleep causes more reflux than the left lateral position
- The quality of food you eat can impact your sleep
- Lack of sleep can influence your appetite
Digestion continues during sleep, but at a slower pace
The human body is capable of sleeping and digesting simultaneously. However, the process of digestion slows down during sleep. This is because the body is not consuming any more food or drink, and the digestive system is taking a break. The digestive tissues repair and grow during this period, fuelled by glucose from earlier meals.
While digestion does continue during sleep, eating a large meal too close to bedtime does not give the digestive system adequate time to rest. This can lead to issues such as heartburn, indigestion, and acid reflux, which may disrupt sleep. It is recommended that meals are timed to be further from one's nightly rest. This is because the body takes a long time to fully digest a meal, approximately 6-8 hours.
During sleep, the gastrointestinal system slows down, and salivation is decreased. This causes a prolongation of acid clearance during sleep. The quality of food also makes a difference, with low-fibre, highly processed, or sugary foods potentially disrupting sleep. Caffeine and alcohol consumption can also negatively impact sleep quality and digestion.
The bidirectional relationship between digestion and sleep is complex. A lack of sleep can influence appetite and the release of hunger and fullness hormones. Poor sleep quality can also worsen gastrointestinal distress, and issues such as acid reflux can make it harder to fall asleep.
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Poor sleep can disrupt digestion, causing indigestion and acid reflux
Poor sleep can have a detrimental impact on the digestive system, causing issues such as indigestion and acid reflux. Firstly, it is important to note that digestion does continue during sleep, but at a slower pace. This period of slower digestion allows the body to repair and grow new digestive tissues, which are fuelled by glucose from earlier meals.
However, if you experience poor sleep, this repair process can be disrupted, leading to indigestion. Poor sleep can also cause cravings for sugary and carb-heavy snacks, as the body seeks more fuel to compensate for low energy levels. These refined, processed carbohydrates are harder for the body to break down, often resulting in constipation. Additionally, a lack of sleep can lead to elevated levels of ghrelin, the hunger hormone, while decreasing levels of leptin, an appetite suppressor. This imbalance can result in binge eating, further straining the digestive system.
Furthermore, poor sleep has been linked to a higher risk of inflammation in the body. Sleep deprivation affects the balance of neurochemicals such as serotonin and melatonin, which are crucial for the sleep-wake cycle and digestive function. This disruption can have a negative impact on bowel movements and pain sensitivity. For individuals with pre-existing digestive disorders, such as IBD or IBS, poor sleep may trigger a flare-up of symptoms.
In terms of acid reflux, or gastroesophageal reflux disease (GERD), the relationship is complex and bidirectional. Sleep disturbances may induce or worsen GERD, while the symptoms of GERD can also provoke sleep disruptions. During sleep, acid clearance mechanisms, including swallowing and salivation, are reduced, leading to a longer acid contact time in the oesophagus. This can cause a burning sensation in the chest or throat, nausea, and other unpleasant symptoms associated with acid reflux.
To mitigate the impact of poor sleep on digestion, it is advisable to align meal times with your circadian rhythms and avoid large meals close to bedtime. Additionally, establishing a consistent sleep schedule and incorporating relaxation techniques before bed can help improve sleep quality and, consequently, support healthy digestion.
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The right lateral position during sleep causes more reflux than the left lateral position
Digestion does indeed continue while we sleep, although it slows down. The digestive system is still active, but at a much slower pace, allowing the body to rest and repair. This is why it is recommended to avoid eating a large meal too close to bedtime, as it can lead to issues like heartburn, indigestion, and acid reflux, which can disrupt sleep.
Transient lower oesophageal sphincter relaxation is the most common cause of gastro-oesophageal reflux. The frequency of this transient relaxation is very low during sleep. However, the right lateral position during sleep causes more reflux episodes than the left lateral position. This is supported by several studies, which have shown that sleeping in the left lateral decubitus (LLD) position decreases nocturnal reflux in patients with gastroesophageal reflux disease (GERD) compared to the right lateral decubitus (RLD) position.
The 2022 American College of Gastroenterologists (ACG) guidelines recommend the LLD sleeping position as one of the lifestyle modifications for managing GERD. Sleeping with the head elevated and lying on the left side has been shown to reduce gastric acid exposure and improve nocturnal GERD symptoms. This can be explained by the anatomy of the gastroesophageal junction in GERD patients. When lying on the right side, the oesophagus is positioned inferior to the gastroesophageal junction, which can further precipitate reflux and prolong acid clearance time.
A double-blind, randomised, sham-controlled trial was conducted to test the effectiveness of sleep positional therapy in patients with nocturnal gastroesophageal reflux. Patients were advised to sleep in the LLD position and were randomly assigned to an electronic sleep positional therapy wearable device that vibrated when they were in the RLD position. The intervention group experienced significantly more nights free of reflux compared to the sham group, demonstrating the effectiveness of avoiding the RLD position in reducing nocturnal reflux.
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The quality of food you eat can impact your sleep
The quality of food you eat can have a significant impact on your sleep. Firstly, eating a big meal too close to bedtime does not give your digestive system enough time to rest, which can lead to disrupted sleep. This is because digestion naturally slows when you sleep, and eating too much or too soon before bed can cause discomfort and a feeling of fullness. Spicy foods, in particular, can cause painful heartburn, making it difficult to lie down and fall asleep. They can also raise your body temperature, forcing your body to work harder to cool down before sleeping.
Consuming a diet low in fibre and high in saturated fat may also decrease the amount of deep, restorative sleep. Excess sugar can cause more frequent awakenings, and sugary, highly processed foods may negatively impact sleep quality. On the other hand, a balanced diet with adequate amounts of carbohydrates, fats, and proteins is associated with improved sleep. Whole grains are preferable to simple carbohydrates and highly processed grains, as they are healthier and may enhance sleep.
In addition, specific foods have been linked to better sleep quality. For example, foods containing the amino acid tryptophan, such as milk, fatty fish, tart cherry juice, and kiwifruit, have been found to improve sleep. Foods rich in B vitamins, such as fish, lean poultry, legumes, eggs, and dairy, are also believed to help regulate melatonin, which is essential for good sleep.
It is important to note that the relationship between sleep and diet is complex, and more research is needed to fully understand how food choices directly impact sleep. However, maintaining healthy eating habits and aligning meal times with your circadian rhythms can promote better sleep quality and overall health.
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Lack of sleep can influence your appetite
Sleep plays a crucial role in regulating the production of hormones that control appetite, digestion, and metabolism. Getting a good night's rest promotes a healthy balance of hormones, including leptin and ghrelin, which are essential for regulating hunger and energy balance. Lack of sleep can disrupt this balance, leading to increased ghrelin levels, which stimulate appetite, and decreased leptin levels, resulting in reduced feelings of fullness. This hormonal imbalance can cause you to feel hungrier throughout the day, leading to a higher calorie intake and potential weight gain.
Several studies have found a link between sleep loss and increased appetite, particularly for highly palatable and rewarding snacks like cookies, candy, and chips. Sleep-deprived individuals may struggle to resist these types of foods, even when they have already met their caloric needs. The effects of sleep loss on appetite tend to be strongest in the late afternoon and early evening, times when snacking has been associated with weight gain.
The impact of sleep deprivation on appetite may be influenced by changes in the endocannabinoid system, which is associated with the pleasure and satisfaction gained from eating. Sleep restriction appears to enhance this system, leading to an increased desire for food intake, especially high-calorie options. This can result in excessive food consumption, particularly in the form of snacks, even when there is minimal increase in energy needs.
Additionally, poor sleep can disrupt digestion, causing issues like indigestion and acid reflux. Eating a large meal close to bedtime can contribute to these issues and disrupt sleep quality. Aligning meal times with your circadian rhythms can help optimize both sleep and digestive health.
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Frequently asked questions
No, the digestive system continues to work while we sleep, but it slows down.
During sleep, the body's tissues are repairing and rebuilding themselves, memories are being consolidated, and the body may be fighting off infections. All of these processes require energy, which primarily comes from glucose, derived from the food we have consumed.
Poor sleep can negatively impact digestion, leading to issues like indigestion and acid reflux. Similarly, eating a large meal too close to bedtime can cause heartburn, indigestion, and acid reflux, which may disrupt sleep.
Eating a smaller meal or snack a couple of hours before bed can help. It is also recommended to avoid highly fibrous, fatty, spicy, or acidic foods.
