The best way to sleep depends on your body, but for most people, sleeping on your side or back with a consistent schedule and a cool, dark room will deliver the highest quality rest. Adults need at least seven hours per night, and how you set up your sleep environment matters just as much as how long you stay in bed.
Best Sleep Positions Ranked
Side sleeping is considered the optimal position for breathing. It keeps your airway open by preventing the tongue and soft tissues from collapsing into the back of your throat, which reduces snoring and helps with sleep apnea. If you deal with acid reflux, sleeping on your left side specifically positions the esophagus above the stomach, making it harder for acid to travel upward. Left-side sleeping is also the recommended position during pregnancy because it promotes blood flow to the uterus and reduces leg swelling.
The tradeoff: side sleeping doesn’t align your spine as well as lying on your back. It can concentrate pressure on your neck, hips, or whichever shoulder you’re resting on. If you wake up with numbness in an arm or shoulder pain, your side-sleeping setup likely needs adjusting (more on pillows below).
Back sleeping is the best position for spinal alignment. It distributes your weight evenly and takes pressure off your joints, which means less morning stiffness in the neck, back, and hips. Placing a small pillow under your knees or lower back enhances this effect. The downside is significant for some people: gravity pulls all the soft tissue in your throat backward, making back sleeping one of the worst positions for snoring, sleep apnea, or anyone who carries extra weight around their midsection. It can also worsen acid reflux.
Stomach sleeping isn’t recommended for most people. It forces your neck into a rotated position for hours at a time and puts unnecessary strain on your lower back.
How Your Pillow Affects Alignment
A pillow that’s too high or too flat for your sleep position creates the same neck strain you’re trying to avoid. The goal is keeping your head, neck, and spine in a neutral line, as if you were standing upright.
Side sleepers need a taller pillow to fill the gap between the mattress and their head. A loft (height) of roughly 10 to 14 centimeters works for most people, with broader-shouldered individuals needing the higher end of that range and smaller-framed people doing better around 10 to 11 centimeters. Back sleepers need a medium-height pillow, around 7 to 10 centimeters, just enough to support the natural curve of the neck without pushing the head forward.
How Much Sleep You Actually Need
The CDC’s current recommendations break down by age:
- Adults 18 to 60: 7 or more hours
- Adults 61 to 64: 7 to 9 hours
- Adults 65 and older: 7 to 8 hours
- Teens (13 to 17): 8 to 10 hours
- School-age children (6 to 12): 9 to 12 hours
These aren’t aspirational targets. They reflect the amount of sleep your body needs to cycle properly through light sleep, deep sleep, and REM sleep. A full cycle takes about 80 to 100 minutes, and you need several complete cycles per night. Deep sleep handles physical repair. REM sleep, when your brain is nearly as active as it is while you’re awake, is when dreaming occurs and memory consolidation happens. Cutting your sleep short by even an hour consistently shaves off REM-heavy cycles that tend to cluster toward the end of the night.
Keep a Consistent Schedule
Your body runs on an internal clock (your circadian rhythm) that regulates when you feel alert and when you feel drowsy. When your sleep and wake times shift around, even by an hour or two on weekends, it creates a form of internal jet lag. Over time, circadian rhythm disruptions are linked to metabolic problems and make it harder to fall asleep and stay asleep on the nights that matter most.
The single most effective habit is waking up at the same time every day, including weekends. Your body anchors its entire sleep-wake cycle to when it expects morning light and activity. A fixed wake time trains your internal clock so that drowsiness arrives predictably at night.
Set Up Your Bedroom for Sleep
Room temperature has a surprisingly large effect on sleep quality. Your core body temperature needs to drop slightly to initiate and maintain sleep, and a warm room fights that process. Most sleep experts recommend setting your thermostat between 65 and 68°F (about 18 to 20°C). For infants, a degree or two warmer, up to about 69°F, is appropriate.
Darkness matters too. Any light exposure during the night, even from a hallway or charging indicator, can interfere with the hormones that keep you asleep. Blackout curtains or a sleep mask are simple fixes that make a measurable difference.
What to Avoid Before Bed
Screens are a bigger problem than most people realize. The blue-enriched light from phones, tablets, and laptops suppresses your body’s natural production of the hormone that signals sleepiness. Harvard Health recommends avoiding bright screens two to three hours before bed. If that feels unrealistic, even one hour of screen-free time before sleep helps, and using night mode or reducing brightness is better than nothing.
Caffeine has a half-life of several hours, meaning half of what you consumed is still circulating in your bloodstream long after you’ve finished your coffee. Research shows that caffeine consumed as early as six hours before bedtime can disrupt sleep, even when you don’t feel wired. A practical cutoff is around 2 or 3 p.m. for anyone with a standard evening bedtime.
Eating a large meal too close to bedtime forces your digestive system into high gear right when your body is trying to wind down. A light dinner finished two to three hours before sleep gives your body time to transition. This is especially important if you’re prone to acid reflux, since lying down on a full stomach makes symptoms worse regardless of your sleep position.