Most adults need at least seven hours of sleep per night, but getting there consistently is harder than it sounds. A joint consensus statement from the American Academy of Sleep Medicine and Sleep Research Society confirms that regularly sleeping less than seven hours is linked to weight gain, heart disease, depression, weakened immunity, and increased risk of accidents. If you’re waking up too early or struggling to stay asleep through the night, the fix usually involves a combination of environmental changes, habit adjustments, and better timing of what you eat and drink.
Cool Your Bedroom to the Right Range
Room temperature is one of the most overlooked factors in how long you stay asleep. Your body needs to maintain a skin temperature between about 31 and 35°C to sleep well, and the easiest way to support that is keeping your bedroom between 19 and 21°C (roughly 66 to 70°F). Deviating from this range increases the likelihood of mid-night awakenings. Even tiny shifts in skin temperature, as small as 0.4°C, can measurably change how quickly you fall asleep.
If your bedroom runs warm, a fan, lighter blankets, or breathable sheets can help. If it runs cold, socks or an extra layer may keep your extremities warm enough to prevent your body from waking you up to generate heat. The goal is a room that’s cool but comfortable, not one where you’re shivering.
Move Your Caffeine Cutoff Earlier
Caffeine taken six hours before bedtime still has significant disruptive effects on both how long you sleep and how restful that sleep feels. That’s not a rough guideline. A study published in the Journal of Clinical Sleep Medicine tested caffeine at zero, three, and six hours before bed and found meaningful reductions in total sleep time at every interval, including the six-hour mark. For most people, the practical takeaway is to stop drinking coffee, energy drinks, or strong tea by early to mid-afternoon, ideally before 5 p.m.
The tricky part is individual variation. Caffeine’s half-life in healthy adults ranges widely enough that some people clear it in four hours while others take closer to eleven. If you’re doing everything else right and still waking too early, experiment with pushing your last caffeinated drink earlier in the day and see if your sleep stretches.
Rethink Evening Alcohol
A drink or two in the evening might help you fall asleep faster, but it reliably disrupts the second half of your night. Alcohol suppresses REM sleep during the first few hours, and your brain compensates with a “rebound effect” later, producing a surge of lighter, more fragmented sleep in the early morning hours. The buildup of alcohol byproducts as your body metabolizes the drink adds to this disruption. The result is that you fall asleep quickly but wake up at 3 or 4 a.m. and can’t get back to sleep, or you sleep through but wake up feeling unrested.
If extending your sleep is the goal, cutting alcohol for a few weeks is one of the fastest ways to test whether it’s a factor. Many people are surprised by how much longer they sleep once they remove even moderate evening drinking.
Get Morning Sunlight Before 10 a.m.
Your internal clock depends on light exposure to set its timing, and morning sunlight is the strongest signal it receives. Research published in BMC Public Health found that every additional 30 minutes of sunlight exposure before 10 a.m. shifted the midpoint of sleep earlier by about 23 minutes. That means morning light doesn’t just help you fall asleep sooner at night; it pulls your entire sleep window into better alignment, making it easier to get a full night’s rest without waking too early or too late.
This works because morning light suppresses melatonin production at the right time, setting you up for a stronger, better-timed release of melatonin in the evening. You don’t need to stare at the sun. A 20- to 30-minute walk, eating breakfast near a window, or even sitting outside with coffee counts. Overcast mornings still provide far more light than indoor lighting, so don’t skip this on cloudy days.
One important counterpoint: light exposure after 3 p.m. also affected circadian timing in the same study, but in the opposite direction. Heavy late-afternoon and evening light exposure can push your sleep window later, making it harder to get enough hours before your alarm goes off.
Be Strategic About Naps
Napping during the day reduces your body’s built-up sleep pressure, which is the biological drive that makes you feel sleepy at night. If you nap too long or too late, you may find yourself lying awake at bedtime, effectively trading daytime rest for nighttime sleep and not gaining any total hours.
That said, the relationship between naps and nighttime sleep is more nuanced than “never nap.” Some research in adolescents and younger adults found that even 60- to 90-minute naps didn’t significantly cut into nighttime sleep. The key variables are timing and your age. A short nap (20 to 30 minutes) taken in the early afternoon, when your body naturally dips in alertness, is the safest bet. If you’re over 60 and struggling with nighttime sleep duration, reducing or eliminating naps is worth trying first.
Use the 20-Minute Rule When You Wake Up
One of the core techniques from cognitive behavioral therapy for insomnia is surprisingly simple: if you’ve been awake in bed for 15 to 20 minutes and aren’t falling back asleep, get up. Go to another room, do something calm like reading a book in low light, and return to bed only when you feel sleepy again. This prevents your brain from learning to associate your bed with wakefulness, which is one of the most common reasons people develop chronic difficulty staying asleep.
The practical side matters here. Have a plan ready before it happens. Keep a light on in the living room, have a book set out, and make the process feel routine rather than frustrating. The worst thing you can do is lie in bed watching the clock and calculating how many hours you have left, which creates anxiety that makes sleep even harder to reach.
Why Sleep Gets Shorter With Age
If you used to sleep eight hours easily and now struggle to hit seven, age may be part of the picture. A meta-analysis of 65 studies found that total sleep time decreases by about 10 minutes per decade across adulthood. The deepest stage of sleep, which is the most restorative, declines by roughly 2% per decade up to age 60. At the same time, the number of brief awakenings during the night increases, and sleep efficiency (the percentage of time in bed that you’re actually asleep) drops steadily.
This doesn’t mean you should accept poor sleep as inevitable. It means that the strategies in this article become more important as you age, not less. Older adults often benefit most from tightening their sleep environment, maintaining consistent wake times, and limiting naps. The recommended range of seven or more hours still applies, though some flexibility exists for individuals recovering from illness or sleep debt, where nine or more hours may be appropriate temporarily.
Consider Magnesium
Magnesium is one of the few supplements with reasonable evidence behind it for sleep. A clinical trial found that 500 mg of elemental magnesium taken daily for eight weeks increased sleep duration and decreased the time it took to fall asleep in older adults. The findings come from the CARDIA study, which also looked at dietary magnesium intake and found associations with both sleep duration and sleep quality.
Magnesium glycinate is the form most commonly recommended for sleep because it’s well absorbed and less likely to cause digestive issues. If you’re considering trying it, start with a lower dose and give it several weeks. Magnesium is unlikely to produce dramatic results on its own, but combined with the behavioral and environmental changes above, it can be a helpful piece of the puzzle.