If you’re struggling to fall asleep, the fix usually comes down to a handful of physical and behavioral changes you can start tonight. Adults need at least 7 hours of sleep per night, according to the CDC, but getting there depends on working with your body’s natural sleep signals rather than fighting them. Here’s what actually helps.
Why You Can’t Fall Asleep
Your brain uses two systems to regulate sleep. The first is sleep pressure: a chemical called adenosine builds up in your brain throughout the day, gradually making you feel drowsy. The longer you’ve been awake, the more adenosine accumulates and the sleepier you get. The second system is your circadian rhythm, an internal clock synced to light and darkness that tells your body when to release melatonin, the hormone that signals it’s time for sleep.
When either of these systems gets disrupted, sleep suffers. Caffeine, for example, blocks adenosine receptors in the brain. It reaches your central nervous system roughly 30 minutes after you drink it, and its effects linger for hours. If you’re having trouble sleeping, cutting off caffeine by early afternoon gives your body time to clear it.
Light exposure is the other major disruptor. A two-hour exposure to blue light (around 460 nm, the wavelength emitted by phones, tablets, and laptops) in the evening suppresses melatonin production. Even surprisingly low light levels of 5 to 10 lux can shift your circadian rhythm when you’re exposed at night. For reference, a dim nightlight puts out about that much. Bright overhead lighting is far stronger.
Set Up Your Bedroom for Sleep
Temperature matters more than most people realize. Your body needs to cool down slightly to initiate sleep, and a warm room works against that process. The Cleveland Clinic recommends keeping your bedroom between 60 and 67°F (15 to 19°C). If that sounds cold, try starting at 67 and adjusting down over a few nights. For babies and toddlers, the ideal range is a bit higher, between 65 and 70°F.
Beyond temperature, keep the room as dark as possible. Blackout curtains or a sleep mask block the ambient light that can interfere with melatonin. If you use your phone as an alarm, place it face down or across the room so the screen doesn’t light up during the night. White noise machines or earplugs can help if sound is the issue, but the biggest environmental levers are darkness and cool air.
Breathing Techniques That Work Tonight
If you’re lying in bed with a racing mind, controlled breathing is one of the fastest ways to shift your nervous system from alert mode into a calmer state. The 4-7-8 technique has some research behind it: inhale quietly through your nose for a count of 4, hold your breath for 7 seconds, then exhale slowly through your mouth for a count of 8. Repeat for three to four cycles.
A study in healthy young adults found that the 4-7-8 method significantly increased parasympathetic nervous system activity, which is the “rest and digest” branch that slows your heart rate and relaxes your muscles. It also decreased sympathetic (fight-or-flight) activity. The effect was strongest in people who weren’t already sleep-deprived, but it’s worth trying regardless.
The military sleep method is another popular approach, though it hasn’t been formally studied. The sequence goes like this: close your eyes and take several slow, deep breaths. Relax all the muscles in your face, starting from your forehead and moving down through your cheeks, jaw, and tongue. Then drop your shoulders, letting them sink into the bed, and relax your arms one at a time. Work your way down through your chest, legs, and feet. The goal is to systematically release tension you may not even realize you’re holding. Some people report falling asleep within two minutes, though there’s no clinical data confirming that specific timeline.
What to Eat and Drink (and Avoid)
Alcohol is one of the most misunderstood sleep aids. It may help you fall asleep faster, but it disrupts the architecture of your sleep in ways that leave you worse off. Research shows that alcohol delays the onset of REM sleep and reduces total REM time, which is the stage critical for memory consolidation and emotional regulation. The damage is concentrated in the second half of the night: after your body metabolizes the alcohol, you experience significantly more wakefulness, lighter sleep, and reduced sleep efficiency. You might fall asleep at 11 but find yourself wide awake at 3 a.m.
Caffeine is the other obvious culprit. Because it directly blocks the brain chemical responsible for making you feel sleepy, even a mid-afternoon coffee can interfere with your ability to fall asleep hours later. If you’re sensitive to caffeine, noon is a reasonable cutoff.
Heavy meals close to bedtime can also keep you up. Your body has to work to digest a large meal, which raises your core temperature and keeps your metabolism active when it should be winding down. A light snack is fine, but try to finish big meals at least two to three hours before bed.
Supplements Worth Considering
Magnesium plays a role in sleep by activating GABA, a brain chemical that calms neural activity and reduces excitability in the nervous system. One clinical trial found that 500 mg of elemental magnesium taken daily for eight weeks significantly increased sleep duration and decreased the time it took to fall asleep in older adults. Magnesium glycinate is the form most commonly recommended for sleep because it’s well absorbed and less likely to cause digestive issues.
Melatonin supplements are widely available, but dosing is inconsistent because the FDA doesn’t regulate melatonin as a drug. Studies have used doses ranging from 0.1 mg to 10 mg, typically taken up to two hours before bedtime. Many sleep experts suggest starting low, around 0.5 to 1 mg, since your body only produces small amounts naturally. Higher doses don’t necessarily work better and can leave you groggy the next morning. Melatonin is most useful for circadian rhythm issues like jet lag or shift work, rather than as a nightly sleep aid.
Build a Consistent Sleep Routine
Your circadian rhythm thrives on predictability. Going to bed and waking up at roughly the same time every day, including weekends, is one of the most effective long-term strategies for better sleep. This consistency reinforces your body’s internal clock so that sleepiness arrives reliably at bedtime.
In the hour before bed, dim the lights in your home and avoid screens. If you have to use a phone or laptop, enable the warm-light or night mode filter, though dimming overall brightness matters more than the color filter alone. Reading a physical book, stretching, or taking a warm shower (which paradoxically helps cool your core temperature afterward) are all effective wind-down activities.
If you’ve been lying in bed for more than 20 minutes without falling asleep, get up and do something quiet in another room with low lighting until you feel drowsy again. Staying in bed while frustrated trains your brain to associate the bed with wakefulness rather than sleep.
When Sleeplessness Becomes Insomnia
Occasional bad nights are normal. Clinical insomnia is defined as sleep difficulty occurring at least 3 nights per week for at least 3 months. If that describes your situation, the issue likely goes beyond sleep hygiene. Cognitive behavioral therapy for insomnia (often called CBT-I) is the first-line treatment and has a strong track record. It works by identifying and changing the thoughts and behaviors that perpetuate poor sleep, and it’s available through therapists, sleep clinics, and digital programs. Unlike sleep medications, the improvements from CBT-I tend to last after treatment ends.