Getting more sleep starts with two things: building enough sleep pressure during the day and removing the habits that sabotage your night. Adults need seven or more hours per night to sustain health, according to a consensus panel from the American Academy of Sleep Medicine, and sleeping six hours or fewer is considered inadequate. If you’re falling short, the fixes below target the specific biological processes that control when you fall asleep, how long you stay asleep, and how restorative that sleep actually is.
How Your Brain Decides When to Sleep
Your brain tracks how long you’ve been awake by measuring a byproduct of cellular metabolism called adenosine. The more active and alert you are during the day, the more adenosine accumulates. This buildup creates what sleep scientists call “sleep pressure,” the growing urge to sleep that intensifies the longer you stay awake. When you finally do sleep, your brain clears adenosine and resets the clock.
This system explains why a sluggish, sedentary day can leave you tired but unable to fall asleep at night. You feel fatigued, but you haven’t built enough sleep pressure. Exercise increases adenosine levels in the brain and directly promotes sleep. Physical activity during the day is one of the most reliable ways to fall asleep faster at bedtime, though finishing intense workouts at least a few hours before bed keeps your body temperature and heart rate from working against you.
Cut Caffeine Earlier Than You Think
Caffeine works by blocking the receptors that detect adenosine. Your brain is still accumulating sleep pressure, but caffeine prevents you from feeling it. The general recommendation is to stop caffeine intake by 2 or 3 p.m. if you follow a standard evening bedtime. One study found that caffeine consumed as early as six hours before bed still disrupted sleep, even when participants didn’t notice the disruption themselves. That’s the tricky part: you may feel like caffeine doesn’t affect your sleep, but it can quietly reduce sleep quality without waking you up.
Alcohol Makes Sleep Worse, Not Better
A drink in the evening might help you fall asleep faster, but it fragments the second half of your night. Alcohol initially acts as a sedative, increasing deep sleep early on. But as your body metabolizes it, sleep becomes shallow and broken. Wakefulness and transitions between sleep stages increase, and REM sleep (the phase tied to memory, emotional processing, and dreaming) gets suppressed in a dose-dependent way. The more you drink, the more REM you lose.
Even moderate drinking close to bedtime leads to more nighttime awakenings and less restorative sleep overall. If you’re trying to get more sleep, reducing or eliminating alcohol in the hours before bed is one of the highest-impact changes you can make.
Control Light Exposure Morning and Night
Light is the most powerful signal your body uses to set its internal clock. Getting outside within the first 30 to 60 minutes after waking, for just 5 to 15 minutes of natural sunlight without sunglasses, helps anchor your circadian rhythm so your body knows when to start producing the sleep hormone melatonin later that evening.
At night, the equation reverses. Any light suppresses melatonin, but blue light (the wavelength dominant in phone screens, tablets, and LED bulbs) is especially disruptive. Harvard researchers found that blue light suppressed melatonin for about twice as long as green light and shifted circadian timing by three hours compared to 1.5 hours for green light. Even dim light has an effect. A brightness of just eight lux, roughly twice what a night light produces, is enough to interfere with melatonin secretion. Most table lamps exceed that level.
Practical steps: dim your indoor lights in the hour or two before bed, use warm-toned bulbs in your bedroom, and put screens away. If you must use a phone or computer, enable a blue-light filter, but know that reducing screen time entirely is more effective.
Set Your Bedroom Up for Sleep
Your body needs to drop its core temperature slightly to initiate sleep, which is why a cool room helps. The optimal bedroom temperature for adults is between 60 and 67°F (15 to 19°C). Think of your bedroom as a cave: cool, dark, and quiet. Blackout curtains, earplugs or a white noise machine, and removing electronics all reinforce the association between your bed and sleep.
Retrain Your Brain to Sleep in Bed
If you’ve spent months or years lying in bed scrolling, watching TV, or staring at the ceiling, your brain may have learned to associate the bed with wakefulness rather than sleep. A technique called stimulus control, developed at Stanford and used in cognitive behavioral therapy for insomnia, directly addresses this.
The rules are simple but effective:
- Go to bed only when you feel sleepy, not just tired or because the clock says you should.
- If you can’t fall asleep within roughly 15 to 20 minutes, get out of bed. Go to another room and do something quiet and low-stimulation until you feel sleepy again, then return.
- Wake up at the same time every morning, including weekends. A consistent rise time strengthens the circadian clock that regulates your sleep-wake cycle.
- Use the bed only for sleep (and sex). No work, no scrolling, no TV.
This approach feels counterintuitive at first because it means spending less time in bed. But it consolidates your sleep, reduces the time you spend lying awake, and over a few weeks retrains the bed as a cue for sleep rather than frustration.
Naps: Keep Them Short and Early
Napping isn’t the enemy, but long or late naps drain your adenosine reserves and reduce the sleep pressure you need at bedtime. If you nap, keep it to 15 to 30 minutes, taken roughly 7 to 9 hours after you wake up. For someone who rises at 7 a.m., that’s a nap between 2 and 4 p.m. Anything longer or later can make it harder to fall asleep that night.
Weekend Catch-Up Sleep Doesn’t Work
If you’re short on sleep during the week, sleeping in on Saturday and Sunday feels like a logical fix. It isn’t. Harvard researchers found that people who cut their sleep by five hours over the workweek and then tried to compensate on weekends still experienced excess calorie intake, reduced energy expenditure, increased weight, and harmful changes in how their bodies used insulin. Even though their sleep debt looked resolved on paper, the metabolic damage was similar to people who stayed sleep-deprived through the entire weekend.
The takeaway is that you can’t bank sleep or repay it in bulk. The only reliable strategy is getting enough sleep consistently, most nights of the week.
When Melatonin Supplements Help
Melatonin supplements don’t knock you out the way a sleeping pill does. They provide a mild signal to your brain that it’s time for sleep, which is why they work best for people whose circadian timing is off (jet lag, shift work, or a naturally late sleep schedule) rather than for general insomnia. Cleveland Clinic recommends starting with 1 mg and increasing by 1 mg per week, up to a maximum of 10 mg, until you notice a reduction in the time it takes to fall asleep.
The effect is easy to override. If you take melatonin and then pick up your phone, scroll social media, or lie in bed with a racing mind, you’ll likely overpower whatever benefit the supplement provides. Melatonin works best as one piece of a larger routine, taken 30 to 60 minutes before bed in a dim, screen-free environment.
Putting It All Together
The most effective approach combines several of these changes rather than relying on any single fix. A realistic nightly routine might look like this: stop caffeine by early afternoon, get sunlight in the morning, exercise during the day, dim the lights after dinner, keep screens out of the bedroom, set your thermostat to the mid-60s, and go to bed only when you actually feel sleepy. Wake at the same time every day. If these changes don’t improve your sleep within a few weeks, cognitive behavioral therapy for insomnia (CBT-I) is the first-line treatment recommended by most sleep medicine guidelines and is more effective long-term than medication for chronic sleep problems.