Several options can help you sleep better, ranging from supplements like melatonin to over-the-counter antihistamines to lifestyle-based approaches. The best choice depends on whether you struggle to fall asleep, stay asleep, or both, and how often the problem occurs. Here’s what actually works, what to watch for, and how to use each option effectively.
Melatonin: Best for Falling Asleep
Melatonin is the most popular sleep supplement, and it works differently than most people assume. It doesn’t knock you out. Your brain naturally produces melatonin as darkness falls, signaling that it’s time to wind down. Taking a supplement amplifies that signal, which makes it particularly useful if your internal clock is off, such as after travel, shift work, or a stretch of late nights.
The effective dose is lower than what most products suggest. Johns Hopkins sleep experts recommend starting at 1 to 3 milligrams, taken about two hours before your target bedtime. Many gummies and tablets contain 5 or 10 milligrams, which can leave you groggy the next morning without helping you sleep any faster. More is genuinely not better here.
One issue worth knowing: a JAMA study testing 25 melatonin gummy products found that 88% were inaccurately labeled. Actual melatonin content ranged from 74% to 347% of what the label claimed. That means a product labeled 3 milligrams could contain anywhere from about 2 to over 10 milligrams. Choosing a product that carries a third-party testing seal (like USP or NSF) reduces this risk.
Over-the-Counter Antihistamines
The two active ingredients in OTC sleep aids like ZzzQuil, Unisom, and store-brand “PM” formulas are diphenhydramine and doxylamine. Both are older antihistamines that cause drowsiness as a side effect, and that drowsiness is essentially what’s being sold as a sleep aid.
Doxylamine, the ingredient in Unisom SleepTabs, is typically dosed at 25 milligrams taken 30 minutes before bed, with a half-life of roughly 12 hours. Diphenhydramine, found in most other products, has a similar profile. That long half-life is important: it means about half the drug is still active in your system 12 hours later, which explains the morning grogginess many people experience.
These work reasonably well for occasional sleepless nights, but they’re not a good long-term solution. Your body builds tolerance quickly, often within a few days of consecutive use, so the same dose stops working. They also carry anticholinergic effects, meaning they block a chemical messenger involved in memory, coordination, and bladder function. In older adults especially, this translates to increased fall risk, cognitive impairment, dizziness, and daytime drowsiness. If you’re over 65, these are generally worth avoiding.
Magnesium for Sleep Quality
Magnesium helps your nervous system calm down in a fairly direct way. At normal concentrations, it enhances the activity of your brain’s primary “slow down” signal (the same system targeted by many prescription sleep drugs), reducing neuronal excitability and promoting relaxation. It also regulates calcium movement in muscle fibers, which helps your body physically relax.
A randomized, placebo-controlled trial found that 250 milligrams of elemental magnesium daily for 28 days produced modest but statistically significant improvements in insomnia symptoms among adults who reported poor sleep. The form used was magnesium bisglycinate (sometimes labeled magnesium glycinate), which is better absorbed and less likely to cause digestive issues than cheaper forms like magnesium oxide.
Magnesium won’t dramatically change your sleep overnight. It works gradually, and the benefit is more about sleep quality than sedation. It’s a reasonable option if you want something gentle and well-tolerated to take consistently.
Valerian Root
Valerian is an herbal extract that has been used for sleep for centuries, and the clinical evidence is modestly positive. A systematic review and meta-analysis published in the American Journal of Medicine found that people taking valerian had an 80% greater chance of reporting improved sleep compared to placebo. Four studies that measured the time it took to fall asleep found reductions ranging from about 14 to 18 minutes.
Doses in clinical trials ranged from 225 to 1,215 milligrams per day, with most standardized extracts containing 0.8% valerenic acids (the compound thought to be responsible for the sedative effect). Valerian tends to work better after a week or two of consistent use rather than as a one-night fix. The taste and smell are notoriously unpleasant, so capsules are the practical choice.
Tart Cherry Juice
This one surprises people, but tart Montmorency cherries are one of the few foods with meaningful amounts of naturally occurring melatonin. A randomized, placebo-controlled crossover study found that drinking tart cherry juice concentrate for seven days increased measurable melatonin levels and improved both sleep duration and quality in healthy adults. It’s not as potent as a melatonin supplement, but it provides melatonin alongside other plant compounds that may support its effects. A small glass of concentrate about an hour before bed is the typical approach.
When Prescription Options Come Up
If you’ve tried OTC and supplement options for several weeks without improvement, prescription medications are available in two main categories. The older class works by broadly sedating your brain, which is effective but can cause dependence and next-day impairment. A newer class works by blocking your brain’s wakefulness signals (the orexin system) rather than forcing sedation. Clinical trials comparing these two categories found that the newer drugs shortened the time to fall asleep by about 15 minutes more than the older class, with a generally better side-effect profile. Your doctor can help determine whether either makes sense for your situation.
Combining Sleep Aids With Alcohol
This deserves a clear warning. Alcohol combined with any sedating sleep aid is dangerous, not just inadvisable. Alcohol and sedative medications suppress brain circuits that control breathing through different mechanisms, and when combined, the effects can be synergistic rather than simply additive. That means the combined impact on your breathing, coordination, and consciousness can be far greater than either substance alone. The FDA specifically warns against drinking before or while taking prescription sleep medications due to risks including impaired motor coordination, falls, memory blackouts, and performing complex behaviors (like driving) with no recall. The same caution applies to OTC antihistamines, which add sedation on top of alcohol’s own sedative effects.
Practical Tips for Better Results
Whatever you take, it works better alongside basic sleep habits. Keep your bedroom cool and dark. Stop using screens 30 to 60 minutes before bed, or at minimum use a blue-light filter. Go to bed and wake up at roughly the same time every day, including weekends. Caffeine has a half-life of about five to six hours, so a coffee at 3 PM still has half its caffeine circulating at 9 PM.
If you’re choosing between options, consider your specific problem. Trouble falling asleep points toward melatonin or valerian. Waking up in the middle of the night and not being able to get back to sleep is often more of a stress or anxiety issue, where magnesium or behavioral changes may help more. For a single rough night before a big event, a one-time OTC antihistamine is reasonable. For ongoing sleep problems lasting more than a few weeks, supplements and habit changes are safer starting points than nightly antihistamine use.