Melatonin and Alcohol: What Happens When You Combine Them?

Both melatonin and alcohol affect how we sleep; however, each has a completely different way of doing so. Melatonin is a hormone secreted by the pineal gland in the brain that regulates our sleep-wake cycles.[1] Many individuals choose to take melatonin supplements when experiencing occasional sleep issues or during times of travel.

On the flipside, alcohol is a CNS depressant that alters the way your brain progresses through the various phases of sleep.[2] While consuming melatonin and alcohol together may seem like a simple recipe for extra sleepiness, alcohol actually impairs melatonin’s ability to function normally, reduces quality of sleep, and creates a groggy state of mind.

Below is a comprehensive resource discussing the possibility of alcohol eliminating melatonin, how the drowsiness experienced throughout the remainder of the day intensifies when combining melatonin and alcohol, what to do if you unintentionally consume melatonin after drinking, and alternatives to alcohol if your struggles with sleep are caused by your reliance on alcohol.

Can I Mix Melatonin and Alcohol?

Many healthcare professionals advise against combining melatonin and alcohol, although melatonin is available over-the-counter and is perceived as a relatively weak, all-natural sleep supplement.[3] Over-the-counter products such as melatonin supplements are not subject to FDA regulation in the same way as prescription medications, so the potency and purity of melatonin-based products vary significantly among suppliers.

As mentioned previously, alcohol negatively impacts the central nervous system (CNS) by decreasing brain activity, whereas melatonin stimulates this same system to inform your body that it is time to go to sleep. When both alcohol and melatonin are simultaneously acting on the CNS, the sedative effects created by each can accumulate unpredictably, thereby affecting cognitive functions including memory retention, focus, and reaction time.

Regardless of whether you are combining a bottle of wine with a melatonin tablet prior to bedtime or ingesting beer and then a melatonin pill prior to going to bed, the specifics of the type of beverages being used are far less important than the fact that you have chosen to ingest alcohol. Short-term or low-dose alcohol ingestion can alter the manner in which your body reacts to a typical dose of melatonin, increasing the risk of excessive sedation and dizziness and reducing motor coordination.[4]

Does Alcohol Cancel Out Melatonin?

When considering whether alcohol cancels out melatonin, the response is neither a definitive yes nor no.

Alcohol Interferes With The Sleep Benefits of Melatonin

Drinking can induce sleepiness at night, potentially creating the impression that it aids sleep. However, as your body continues to metabolize alcohol throughout the night, it can disrupt normal sleep cycles, interfering with how your body uses melatonin.[5] Because melatonin relies on your body’s natural sleep/wake cycle to be effective, any disruptions to that cycle can render melatonin less effective.[6]

Not a Complete Eradication

While drinking does not totally cancel out melatonin’s effectiveness, drinking does limit how effectively melatonin functions. The interaction between drinking and melatonin makes for a highly variable outcome among individuals.

One person might experience excessive drowsiness when using melatonin and drinking; others may continue to have difficulty falling or staying asleep. Drinking affects REM sleep and your body’s internal clock that regulates sleep and wakefulness, which melatonin is designed to correct.[7]

Why Does Next-Day Drowsiness Increase?

Most commonly reported next-day drowsiness occurs from two related effects.

Additive Sedative Effects

Sedative effects from melatonin and drinking independently are cumulative, contributing to enhanced sedation, delayed reaction times, decreased concentration and attentiveness, as well as elevated risk for accidents when engaging in activities that require motor skills before the sedative effects subside.[8]

Poor-Quality Sleep Despite a Longer Duration of Sleep

Even after sleeping for a full eight hours (which would otherwise be sufficient), some people still experience prolonged grogginess because drinking suppresses REM sleep and increases the frequency of nocturnal awakenings.[9]

Which Groups Experience Worsened Next-Day Effects?

Next-day drowsiness is exacerbated by multiple factors, including:

• Older age, as metabolic processing for alcohol and melatonin decreases over time
• High doses of melatonin exceeding established recommendations
• Higher amounts of drinking at night
• Compromised liver function from liver disease that slows the clearance of melatonin from the bloodstream
• Concurrent administration of other sedatives, including prescribed or non-prescribed sleep aids, muscle relaxants, or sedating antihistamines

Each factor listed above contributes to disruptions in normal sleep cycles, resulting in missed opportunities for deep sleep, which is critical for restoring energy levels.

I Accidentally Took Melatonin After Drinking. What Do I Need to Do?

Your response will depend primarily on how much you drank.

If you had one or two drinks:

Generally speaking, having one or two drinks prior to taking melatonin is unlikely to be considered a medical emergency. Stay at home for the remainder of the evening. Avoid engaging in any activities requiring motor skill proficiency. Refrain from taking any additional sedatives. Pay close attention to your sensations during the remainder of your evening.

If you drank more than that:

Heavy drinking presents a dramatically elevated risk for excessive sedation, falls, vomiting, and, in some cases, respiratory distress (a serious condition where the body struggles to get enough oxygen).[10] If you or someone you know has consumed excessive amounts of alcohol and also taken melatonin, remain near that person for monitoring purposes instead of relying solely on observation.

Emergency medical care:

Never delay seeking emergency medical care under any circumstances. Call 911 if you or anyone you know has difficulty waking, breathing difficulties, confusion beyond what would reasonably be expected, repeated episodes of vomiting, or loss of consciousness. Each symptom described above could indicate respiratory depression, a serious complication where shallow breathing leads to a buildup of carbon dioxide and a lack of oxygen in the body.

Are There Ever Situations Where Taking Melatonin After Drinking Would Be Safe?

Generally, it is advisable to refrain from taking melatonin immediately following drinking because both substances are still active within your system at once. Once your system has processed out most of the alcohol consumed, it will likely be safer to take melatonin again; however, there is no universally accepted waiting period based on how much you drank or how fast your body processes alcohol.

Factors Influencing Risk

As referenced earlier, numerous factors contribute to determining risk. These include total ounces of alcohol consumed; body mass index (BMI), age, other medications, liver function, presence of an underlying sleep disorder, etc. Two people consuming identical dosages of melatonin after equivalent amounts of drinking could have vastly differing outcomes.

Side Effects to Monitor For

Commonly cited adverse effects of melatonin use are generally minor and include headaches, dizziness, nausea, and daytime somnolence.[11] When combined with alcohol, these adverse effects tend to become more pronounced and can potentially lead to fluctuations in blood pressure or heart rate, an additional potential danger associated with viewing over-the-counter products containing melatonin as harmless merely due to availability without a prescription.

Additionally, these interactions represent one explanation for why individuals utilizing melatonin after drinking experience an elevated risk level relative to those consuming either product separately.

Do Types of Drink Matter?

The amount of alcohol you drink generally matters more than the specific type of drink. A few practical differences worth knowing:

• Wine and melatonin: Consuming wine before bed is common for many, yet it remains an intoxicant and interacts with melatonin in the same way as all other alcoholic beverages. Consuming wine with melatonin may initially produce increased somnolence; nevertheless, the quality of sleep late at night will suffer.
• Beer and melatonin: Combining beer with melatonin poses a comparable interaction risk, although there is one additional consideration: beer’s larger volume can cause nighttime awakenings that necessitate urination.
• Liquor and high-proof beverages: All high-proof liquors pose a greater risk for intoxication when combined with melatonin, presenting an elevated risk for impairment.

What To Do Instead

• Avoid additional sleep aids: Adding additional sedatives (e.g., a second dose of melatonin) to counteract sleep-disruptive aspects of alcohol-induced sleep problems can increase the same risks already identified.
• Stay hydrated: Dehydration (a direct consequence of alcohol consumption) can worsen sleep quality and post-drinking fatigue.
• Allow time for your body to process the alcohol: Your body requires time to eliminate alcohol from your system. Relying on additional substances can ultimately hinder recovery efforts.
• Practice healthy sleep hygiene: The practices and habits that promote healthy, restful sleep. Dimming light sources in your living environment, restricting screen use before bedtime, maintaining a consistent sleep schedule, and keeping a comfortable bedroom temperature can improve sleep quality and overall well-being, regardless of whether you have been diagnosed with one or more sleep disorders.

When To Seek Medical Assistance

If you consistently rely on alcohol to fall asleep, continue experiencing recurring bouts of insomnia, or have repeatedly mixed melatonin with alcohol inadvertently, you may want to consult with a medical professional about ongoing sleep disturbances and disruptions in your sleep patterns.

Disrupted sleep patterns and sleep disturbances can negatively affect your emotional and mood stability, daily productivity and reliability, overall well-being, and your mental health, which is closely linked to sleep, and warrant an examination by a medical professional if you begin to notice these patterns emerging.

If you’re noticing these patterns, it could point to a growing reliance on alcohol or maybe a substance abuse issue tied to something else, like mental health. Talking to a professional or counselor can help you figure out what’s actually driving your sleep problems.

From there, they can walk you through your options, from outpatient counseling and medical detoxification (when healthcare professionals help patients manage withdrawal symptoms safely using medication and other interventions) to residential treatment programs that address both alcohol dependence and any co-existing mental health issues.

Seeking support early on may help prevent a smaller habit from developing into a more significant alcohol dependency requiring more extensive addiction treatment in the future.