Colin Snow
Sleep syncope, or sleep fainting, is a subtype of vasovagal syncope where patients experience syncope after awakening from sleep. It is characterised by nausea, vomiting, abdominal pain, and diarrhoea. Sleep syncope patients have a higher prevalence of gastrointestinal disease in their medical history. During deeper phases of non-rapid eye movement (REM) sleep, there is an increased vagal activity, while muscle sympathetic nerve activity is reduced. Sleep syncope can be caused by a variety of factors, including neurological conditions, cardiac issues, or changes in body position.
| Characteristics | Values |
|---|---|
| Medical term | Syncope |
| Cause | Temporary drop in the amount of blood flowing to the brain |
| Symptoms | Nausea, abdominal pain, vomiting, diarrhoea, irregular breathing, sweating, confusion, tiredness |
| Risk factors | History of phobias, neurological conditions, neurological issues, heart issues, blood flow issues, blood pressure issues, medication side effects, spinal issues, gluten sensitivity, gastrointestinal disease |
| Treatment | Hydration, counter-maneuvers, preventive measures, medication, pacemaker (in rare cases) |
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What You'll Learn
Sleep syncope is a subtype of vasovagal syncope
Syncope is the medical term for fainting or passing out, which occurs when there is a sudden drop in blood flow to the brain. This can be caused by a variety of factors, including heart issues, blood flow problems, and neurological conditions. Reflex syncope is a type of fainting that occurs in response to specific triggers, such as standing for extended periods or experiencing stress.
Sleep syncope, or sleep fainting, is a subtype of reflex syncope known as vasovagal syncope. It is characterised by nocturnal episodes of fainting that occur while the individual is in a supine position, either in bed or immediately after getting up. Patients with sleep syncope often experience associated symptoms such as nausea, sweating, light-headedness, abdominal discomfort, and weakness during the attack, followed by tiredness. In some cases, sleep syncope can be accompanied by nightmares or muscle jerking, leading to potential misdiagnosis as epilepsy.
The exact mechanism of sleep syncope is not yet fully understood, but it is believed to be related to a central trigger similar to that proposed for vasovagal syncope associated with phobias. This suggests a potential gastrointestinal trigger or a cardiovascular autonomic imbalance during sleep. Sleep syncope is a relatively rare condition, with a higher prevalence in females, and it can be effectively managed with proper diagnosis and treatment.
It is important to distinguish sleep syncope from other types of fainting or loss of consciousness, such as seizures, cardiac syncope, or neurologic syncope, as the treatment and management approaches may vary. A thorough medical history, physical examination, and specific tests such as the tilt table test or autonomic reflex testing can help healthcare providers accurately diagnose sleep syncope and determine the best course of treatment for each patient.
While syncope is typically considered less serious than other types of loss of consciousness, it is important to seek medical attention to rule out any underlying causes and prevent future episodes.
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Sleep fainting can be caused by neurological issues
Fainting, or syncope, is a sudden, brief loss of consciousness caused by decreased blood flow to the brain. While fainting is usually harmless and temporary, it can sometimes be indicative of more serious neurological or cardiac issues.
Neurologic syncope occurs when there is an issue in the brain that limits blood flow. This can be caused by neurological conditions such as seizures, strokes, or transient ischemic attacks (TIAs). Additionally, problems with the autonomic nervous system, which controls involuntary vital functions like heart rate and breathing, can also lead to fainting spells. Conditions such as acute or subacute dysautonomia, chronic postganglionic autonomic insufficiency, and chronic preganglionic autonomic insufficiency can cause fainting by disrupting the body's regulation of blood pressure.
In some cases, sleep fainting may be a result of neurocardiogenic factors. For example, a 43-year-old man experienced three successive syncopal attacks, one of which occurred while getting up from sleep. He exhibited symptoms such as profuse sweating, nausea, abdominal pain, and irregular breathing patterns. Similarly, a 67-year-old man presented with multiple episodes of sleep fainting, characterized by labored breathing and difficulty being aroused from sleep. These cases highlight how sleep fainting can be associated with underlying neurological or cardiac causes that require medical attention.
While the exact mechanisms of sleep fainting remain unclear, it is believed to be related to vagal stimulation and a negative response to a head-up tilt (HUT) test. Sleep fainting is typically diagnosed based on strong clinical suspicion and the exclusion of other neurological and cardiac causes. Management strategies include reassurance, avoidance of triggers, hydration, and counter-maneuvers, although the effectiveness of these measures varies among patients.
It is important to note that fainting is not always a cause for concern and often resolves without treatment. However, if you experience frequent fainting spells or have underlying health conditions, it is crucial to seek medical advice to identify and address the underlying cause.
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Cardiac issues can cause sleep syncope
Syncope is the medical term for fainting or passing out, which occurs when there is insufficient blood flowing to the brain. Cardiac syncope is a type of syncope that occurs due to issues with the heart or blood vessels, resulting in a lack of blood flow to the brain. This can be caused by abnormal heart rhythm (arrhythmia), blood clots, heart valve disease, or heart failure.
Cardiac syncope is a serious condition that can indicate an underlying disease or a potentially fatal issue. It is important to distinguish cardiac syncope from other types of syncope, as it can have severe consequences. In some cases, it may lead to sudden cardiac death if left untreated. Therefore, it is crucial for healthcare providers to have a good understanding of cardiac syncope and its management.
The treatment for cardiac syncope aims to prevent morbidity, physical injuries, and the financial burden associated with recurrent syncopal episodes. Management strategies vary depending on the specific condition that triggers the syncope. For instance, if certain medications are found to be causing bradycardia as a side effect, they should be discontinued. In other cases, implantable dual-chamber pacemakers may be recommended to prevent future syncopal events.
Cardiac syncope is often challenging to distinguish from other types of syncope, as there are many potential causes of fainting. To diagnose cardiac syncope, healthcare providers will conduct a physical examination, review the patient's medical history, and ask detailed questions about their symptoms and syncopal episodes. They may also perform specific tests, such as a tilt table test, autonomic reflex testing, electrophysiology studies, or a computed tomography (CT) scan, to help determine the underlying cause of the syncope.
Cardiac syncope is a concerning condition that requires prompt medical attention and appropriate management to prevent serious complications. It is important to seek medical advice if you experience any symptoms of syncope, as early diagnosis and treatment can help prevent future episodes and improve overall health outcomes.
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Sleep fainting can be caused by a drop in blood pressure
Fainting, or syncope, is a temporary loss of consciousness caused by insufficient blood flow to the brain. While fainting is often due to minor issues, it can sometimes indicate a more serious underlying medical problem. Sleep fainting, or supine syncope, can be caused by a drop in blood pressure, which may be linked to various factors and conditions.
One factor that can contribute to a drop in blood pressure during sleep is dehydration. Dehydration can affect blood volume, leading to a decrease in blood pressure. Additionally, certain medications can increase the risk of experiencing a syncopal episode. As such, it is important to discuss any concerns about medication side effects with a healthcare provider.
Orthostatic hypotension, also known as postural hypotension, is a condition characterised by a sudden drop in blood pressure upon standing up. This can occur when an individual's blood pressure is already low during sleep, and the act of standing further reduces blood flow to the brain, potentially resulting in fainting. Postural orthostatic tachycardia syndrome (POTS) is a similar condition that affects the ability to maintain blood pressure when standing, often accompanied by a rapid heart rate (tachycardia).
Sleep fainting may also be associated with cardiac issues. For example, aortic valve abnormalities or other heart valve diseases can cause a temporary loss in blood pressure. Additionally, a very fast or irregular heart rhythm can lead to inefficient blood pumping by the heart, resulting in reduced blood flow to the brain. In some cases, neurological conditions such as seizures, strokes, or transient ischemic attacks (TIAs) can contribute to sleep fainting by impacting blood flow to the brain.
It is important to note that sleep fainting can have various causes, and a comprehensive evaluation by a healthcare professional is necessary to determine the specific underlying cause in each case. This may include a physical examination, a review of medical history, and specific tests such as autonomic reflex testing, electrophysiology studies, or neurological evaluations.
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Sleep syncope can be caused by gastrointestinal issues
Passing out, or syncope, occurs when there is a temporary drop in the amount of blood flowing to your brain. Sleep syncope is a subtype of vasovagal syncope, where patients experience syncope after awakening from sleep.
Abdominal discomfort is likely an effect of vagal over-activity, rather than the cause. The cardio-inhibitory response during tilt table testing suggests a cardiovascular autonomic imbalance that may also occur during sleep. Patients with nocturnal vasovagal syncope should not be treated with anti-epileptics. If long-term ambulant ECG monitoring shows pronounced bradycardia or asystole, a pacemaker may improve symptoms.
The hypothalamus may play a crucial role in the initiation of sleep syncope events, potentially triggered by transitions in the sleep/wake cycle or intense dreams. This ties together the gastrointestinal symptoms mediated by the dorsal motor nerve and the vasovagal cascade mediated by the nucleus ambiguous. A detailed clinical history, physical examination, electrocardiogram, and electroencephalogram can help narrow the diagnosis. Recognizing vasovagal prodromes can increase the specificity to differentiate vasovagal syncope from other causes.
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Frequently asked questions
Passing out in your sleep could be a result of sleep syncope, a subtype of vasovagal syncope, in which patients experience syncope after awakening from their sleep. It could also be caused by a neurological condition or a condition affecting your heart or blood vessels. If you experience repeated episodes of sleep syncope, you should consult a medical professional.
Sleep syncope is associated with symptoms such as nausea, vomiting, abdominal pain, and diarrhoea. A history of phobias has also been reported by many patients experiencing sleep syncope.
If you pass out in your sleep, you should consult a medical professional, especially if it is a recurring issue. They will likely perform a physical exam, review your medical history, and ask you detailed questions about your symptoms and episodes of syncope.
