Ashwin Lewis
Antihistamines are commonly used to treat allergies and are known to cause drowsiness as a side effect. This has led to them being used as sleep aids by people experiencing insomnia. However, experts caution against using antihistamines as a long-term solution for sleep problems due to potential side effects and health risks. Alternatives such as cognitive behavioural therapy (CBT) are recommended as a first-line treatment for insomnia, as they can help improve sleep hygiene and address underlying causes of sleep disturbances.
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What You'll Learn
- Antihistamines block the effects of histamine in the body, which can induce sleepiness
- Diphenhydramine is a sedating antihistamine that can be used to treat short-term sleep problems
- Antihistamines are the main ingredient in many over-the-counter sleep aids
- Experts advise against using antihistamines as a sleep aid due to potential health risks and side effects
- Cognitive behavioural therapy (CBT) is recommended as a first-line treatment for insomnia
Antihistamines block the effects of histamine in the body, which can induce sleepiness
Antihistamines are commonly used to treat allergies. However, they can also be used to aid sleep. The sleep-wake cycle is regulated by chemicals that are naturally produced by the body. As you get ready for sleep, histamine levels in the brain decrease, inducing non-rapid eye movement sleep (NREM). Antihistamines, such as diphenhydramine and doxylamine succinate, cross the blood-brain barrier, mimicking this natural function. This is why you may feel sleepy when you take medications containing them.
Diphenhydramine is a first-generation antihistamine that blocks the effects of histamine in the brain, reducing allergy symptoms such as a runny nose or skin rashes. It enters the brain in large quantities, which can make you feel drowsy. It also blocks the effects of acetylcholine, helping with a cough or runny nose, but potentially causing side effects such as a dry mouth and nose. Diphenhydramine is available over the counter and on prescription, in the form of tablets, liquids, and creams.
Other first-generation antihistamines include hydroxyzine (Atarax). These older antihistamines don't discriminate between which histamine receptors they block, and their medication penetrates the blood-brain barrier, affecting the brain and resulting in a feeling of lethargy. They are prescribed to help with sleep and relaxation, but this can be a serious side effect for those who need to remain alert, such as when driving or operating machinery.
Newer antihistamines, such as loratadine (Claritin) and desloratadine (Aerius), have different chemical structures that don't allow them to enter the brain as easily. They can't access the receptors present in the brain, so they don't cause drowsiness. These once-a-day antihistamines only function to decrease allergy symptoms. However, they can still cause drowsiness in a small percentage of people.
While antihistamines can help with sleep, they are not recommended as a long-term solution for insomnia. The American Academy of Sleep Medicine recommends cognitive behavioural therapy (CBT) as a first-line treatment for insomnia, helping to adjust the circadian rhythm and reduce anxiety about insomnia. Sleep experts advise against over-the-counter sleep aids, as there is a lack of evidence regarding their effectiveness and safety.
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Diphenhydramine is a sedating antihistamine that can be used to treat short-term sleep problems
When you come into contact with an allergen, your body produces histamine, a chemical that can cause symptoms like a runny nose or skin rashes. Diphenhydramine blocks the effects of histamine in your brain, reducing these symptoms. As histamine also plays a role in regulating your sleep-wake cycle, diphenhydramine's interference with histamine production can induce sleepiness.
However, it is important to note that diphenhydramine is not recommended for long-term use as a sleep aid. While it can help with occasional sleep problems, it should not be used to treat chronic insomnia. This is because there is a lack of substantial evidence that it improves sleep quality or duration, and patients can develop a tolerance to the medication within 1 to 2 weeks. Additionally, it can cause side effects such as dry mouth, altered mental state, and urinary retention, and may lead to sleepwalking and other parasomnias, especially in older adults.
Experts generally caution against using antihistamines as sleep aids due to their potential side effects and health risks, especially in older adults and children. Instead, it is recommended to practice good sleep hygiene, which includes maintaining a consistent sleep schedule, avoiding caffeine and alcohol, and minimizing electronic device usage before bedtime. For long-term insomnia, it is advised to consult a physician or sleep specialist to address any underlying medical issues.
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Antihistamines are the main ingredient in many over-the-counter sleep aids
Antihistamines are indeed a common ingredient in many over-the-counter sleep aids. The antihistamine diphenhydramine (Benadryl) is known to cause drowsiness and is often used to help with sleep. It is an older, first-generation antihistamine that can block histamine's effect on wakefulness by blocking the action of histamine at the H1 receptor. This causes the brain to perceive this as the "sleep mode" of the receptor, resulting in feelings of sleepiness.
Diphenhydramine is available in various forms, including tablets, liquids, and creams, and can be purchased from pharmacies without a prescription. It is typically taken 20 minutes before bedtime and starts to induce drowsiness within 20 to 30 minutes. However, it is important to note that diphenhydramine may not be suitable for everyone, as it can cause side effects such as a dry mouth and nose.
While antihistamines can be effective in aiding sleep, it is generally recommended to consult a doctor or sleep specialist before using them for this purpose, especially if sleeplessness persists. Sleep issues could be a sign of underlying conditions, and a specialist can help identify these causes and recommend appropriate treatments or lifestyle changes. For example, cognitive behavioural therapy (CBT) is often suggested as a first-line treatment for insomnia, as it can help improve sleep hygiene and address any anxiety or stress surrounding sleep.
Additionally, it is important to be cautious about the long-term use of antihistamines as sleep aids, as they may pose health risks and cause unwanted side effects, especially in older adults. Experts generally advise against relying on over-the-counter sleep aids, as there is limited evidence of their effectiveness and safety. Instead, addressing sleep issues through CBT, improving sleep hygiene, or consulting a doctor for personalised advice is recommended.
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Experts advise against using antihistamines as a sleep aid due to potential health risks and side effects
While antihistamines can make you feel drowsy and may help you fall asleep, experts advise against using them as a sleep aid due to potential health risks and side effects.
Antihistamines work by blocking the effects of histamine in the body. Histamine is a chemical produced by your body that can cause symptoms such as a runny nose or skin rashes when you come into contact with something you're allergic to. Antihistamines, such as diphenhydramine and doxylamine succinate, can cross the blood-brain barrier and block the effects of histamine in the brain, reducing symptoms and inducing sleepiness.
However, the side effects of antihistamines can include daytime sleepiness, grogginess, and falls. Additionally, long-term use of antihistamines has been linked to an increased risk of dementia and Alzheimer's disease. As such, the American Academy of Sleep Medicine (AASM) has officially recommended against treating chronic insomnia with common over-the-counter antihistamine sleep aids.
Instead of relying on antihistamines as a sleep aid, experts recommend improving your sleep hygiene and making lifestyle changes. This includes maintaining a consistent sleep schedule, avoiding alcohol, caffeine, and large meals in the evening, and refraining from using electronic devices at least 30 minutes before bed. Cognitive behavioural therapy (CBT) is also recommended as a first-line treatment for insomnia, as it can help adjust your circadian rhythm and reduce anxiety about insomnia.
If you are experiencing chronic insomnia, it is important to consult a healthcare professional. They can help determine the underlying cause and recommend or prescribe appropriate treatments or medications.
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Cognitive behavioural therapy (CBT) is recommended as a first-line treatment for insomnia
Antihistamines are commonly used to treat allergies, relieving symptoms such as a runny nose or skin rashes. Certain antihistamines, such as diphenhydramine, are known as "drowsy" or "sedating" antihistamines as they can make you feel sleepy. This is due to the antihistamine blocking the effects of histamine in the brain, which induces non-rapid eye movement sleep (NREM). As a result, some people use antihistamines to combat insomnia or other short-term sleep problems.
However, despite their effectiveness, antihistamines are not recommended for long-term use as sleep aids due to potential health risks and side effects, especially in older adults. Instead, cognitive behavioural therapy (CBT) is recommended as a first-line treatment for insomnia. CBT for insomnia (CBT-I) is a short, structured, and evidence-based approach that has proven effective for both short-term and chronic insomnia. It involves techniques such as stimulus control, sleep restriction, and relaxation training to improve sleep quality. CBT-I focuses on addressing the connection between thoughts, behaviours, and sleep, helping patients identify and change thoughts, feelings, and behaviours that contribute to insomnia. This includes identifying and eliminating ineffective sleep habits and reducing sleep-related worry and arousal. CBT-I also emphasises sleep hygiene, encouraging healthy sleep habits such as maintaining a consistent sleep schedule, avoiding caffeine and alcohol, and minimising electronic device usage before bed.
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Frequently asked questions
Antihistamines are drugs that block the effects of histamine in the body. Histamine is a natural chemical compound that is involved in the body's local immune response.
Antihistamines work for sleep by blocking histamine's attachment to receptors, inhibiting its role in regulating sleep and wakefulness. This makes the brain see this as the "sleep mode" of the receptor, and you will feel drowsy.
While antihistamines can be effective in aiding sleep, they are not recommended for long-term use due to potential side effects and health risks. The American Academy of Sleep Medicine recommends cognitive behavioural therapy (CBT) as a safer first-line treatment for insomnia.
Some alternatives to antihistamines for sleep include improving sleep hygiene, such as by sticking to a consistent bedtime, avoiding caffeine and alcohol, and limiting screen time before bed.
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