Several options can help you fall asleep, ranging from supplements like melatonin and magnesium to prescription medications and behavioral techniques. The right choice depends on whether your sleep trouble is occasional or chronic, and what’s causing it. Here’s what actually works, what doesn’t hold up, and what to watch out for.
Melatonin: Timing Matters More Than Dose
Melatonin is the most popular sleep supplement, and it does reduce the time it takes to fall asleep. But most people take too much, too late. Your body naturally produces melatonin as darkness falls, and supplements work best when they mimic that natural rise. That means taking melatonin 3 to 4 hours before your target bedtime, not right before you get into bed. If you want to be asleep by 10 or 11 PM, taking it around 6 or 7 PM aligns with your body’s internal clock.
Dose matters too, and lower is better. Studies show that doses as small as 0.3 to 1 mg effectively mimic the natural nighttime levels seen in young adults. The 5 and 10 mg tablets sold in most stores are far higher than what the evidence supports. While melatonin is clinically used at doses up to 20 mg, those higher amounts don’t appear to improve sleep proportionally and can leave you groggy the next day.
One important caveat: melatonin supplements are not tightly regulated. Lab testing has found that the actual melatonin content in supplements can vary by as much as 465 percent from lot to lot within the same product, according to a study highlighted by the American Academy of Sleep Medicine. About 26 percent of tested supplements also contained serotonin, a compound that shouldn’t be in an over-the-counter product. Choosing a brand that uses third-party testing can reduce this risk.
Magnesium and L-Theanine
Magnesium plays a direct role in sleep regulation. It blocks excitatory signals in the brain while boosting the activity of calming pathways, essentially quieting neural activity that keeps you awake. A clinical trial at the National Institutes of Health tested 300 mg of magnesium daily in older adults over eight weeks and found improvements in sleep patterns. If you’re mildly deficient in magnesium (which is common, especially in older adults and people who eat few leafy greens, nuts, or seeds), supplementing may noticeably help.
L-theanine, an amino acid found naturally in green tea, promotes relaxation by influencing serotonin and the brain’s calming neurotransmitter system. Typical doses range from 50 to 400 mg taken 30 to 60 minutes before bed. It won’t knock you out, but it can ease the mental chatter that keeps you staring at the ceiling. Some people combine it with magnesium for a stronger effect.
Herbal Options: Valerian and Chamomile
Valerian root has the strongest clinical backing among herbal sleep aids. A meta-analysis of 18 randomized controlled trials found that valerian significantly reduced the time it took participants to fall asleep compared to placebo. The effect was moderate but consistent across studies. Most valerian supplements are taken 30 to 60 minutes before bed, and the research generally used extracts rather than raw root teas.
Chamomile is gentler. Its active compound activates the same calming receptors in the brain that anti-anxiety medications target, just far more mildly. About 50 mg of this compound (apigenin), taken 30 to 60 minutes before bed, is a commonly cited dose. Chamomile tea contains smaller, variable amounts, so a concentrated extract is more reliable if you’re looking for a measurable effect. Neither valerian nor chamomile carries significant safety concerns for most people, which makes them reasonable starting points for occasional sleeplessness.
Over-the-Counter Antihistamines: A Poor Long-Term Choice
Many people reach for antihistamine-based sleep aids like diphenhydramine (the active ingredient in Benadryl and most “PM” formulations) or doxylamine (found in Unisom SleepTabs). These do make you drowsy, but experts at Baylor College of Medicine warn that the sleep you get is lower quality than normal sleep. You’ll fall asleep, but you won’t feel as rested.
The downsides compound quickly. Most people develop tolerance within days, meaning the same dose stops working. Side effects include dry mouth, urinary retention, mental fogginess the next day, and in some cases sleepwalking or other unusual sleep behaviors. For a night or two of jet lag, antihistamines are unlikely to cause harm. As a regular habit, they offer no lasting benefit and carry real risks, particularly for older adults.
Prescription Sleep Medications
If over-the-counter options haven’t helped, prescription medications fall into two broad categories that work very differently in the brain.
The older class includes benzodiazepines and “Z-drugs” like zolpidem. These amplify your brain’s main inhibitory signals, which does induce sleep but also suppresses activity in areas responsible for balance, memory, and coordination. Because these receptors exist throughout the brain and spinal cord, the sedation is widespread rather than targeted. That’s why side effects can include next-day grogginess, impaired balance, and memory gaps.
A newer class works by a completely different mechanism: instead of forcing the brain into sedation, these medications block the wake-promoting signals that keep you alert. The result is sleep that looks remarkably like natural sleep on brain scans, with normal cycling through all sleep stages including dreaming. Because the wake-promotion system doesn’t directly involve the brain’s balance centers, these newer medications carry less risk of falls and next-morning impairment. Both types require a prescription and carry risks, but the newer approach represents a meaningful shift in how sleep medications work.
One critical safety note applies to all prescription sleep aids: combining them with alcohol is dangerous. Alcohol amplifies their sedative effects in ways that can impair breathing, motor coordination, and judgment. The FDA specifically warns against drinking before or while taking Z-drugs because of the risk of memory blackouts, impaired coordination, and sleep-related behaviors like driving while not fully awake.
Cognitive Behavioral Therapy for Insomnia
If your sleep problems have lasted more than a few weeks, the most effective long-term approach isn’t a pill or supplement. The American Academy of Sleep Medicine identifies cognitive behavioral therapy for insomnia (CBT-I) as the most effective first-line treatment for chronic insomnia, outperforming medication alone. The AASM’s guidelines recommend CBT-I by itself over combination therapy with medication, because behavioral treatment produces durable improvements without the added risks of drugs.
CBT-I works by restructuring the habits and thought patterns that perpetuate insomnia. It typically involves restricting time in bed to match actual sleep time, eliminating stimulating behaviors in the bedroom, and retraining your body’s association between bed and sleep. It’s not a quick fix. The process takes several weeks, and some people temporarily sleep worse before they sleep better. But the positive effects persist long after treatment ends, which no sleep medication can claim. Programs are available in person, through telehealth, and through app-based formats that make it more accessible than it used to be.
Matching the Right Option to Your Situation
For occasional trouble falling asleep, a low-dose melatonin supplement (0.3 to 1 mg) taken 3 to 4 hours before bedtime, magnesium, or L-theanine are reasonable places to start. They carry minimal risk and may be enough if stress, travel, or a disrupted schedule is the culprit.
For sleep trouble that keeps coming back week after week, supplements are unlikely to solve the underlying problem. CBT-I addresses the root causes and has the best evidence for lasting improvement. Adding a short course of medication can help some people during the initial weeks of behavioral treatment, but medication alone tends to stop working once you stop taking it, and some options carry tolerance or dependence risks.
Whatever you try, avoid stacking multiple sedating substances together, especially anything combined with alcohol. The interaction between sedatives isn’t simply additive. It can suppress breathing and coordination in ways that neither substance would alone.