While you sleep

How can I raise my blood oxygen naturally?

By GyroscopeUpdated November 15, 202610 sources

Your body already does most of the work, keeping your blood nearly full without you thinking about it, so in the normal band there’s nothing to raise. If you want to help it, and you can, the natural moves are skipping drinks close to bedtime, sleeping on your side if you snore, losing weight if you snore and carry extra, not smoking, and going up mountains slowly. A run of low nights is a reason to ask about a sleep study.

Search for this and you’ll find a lot of tips, like plants in the bedroom, an open window, special breathing and supplements. Most of them assume your number is a score that more effort can push up. It’s closer to a smoke alarm. In healthy people it sits near the top almost all the time, and when it drops at night there’s usually a reason you can find.

What does your body already do?

Your brain watches your blood all day and night. Nerve cells in your brainstem track carbon dioxide and the acid it makes, and set your breathing to keep it steady. Small sensors in the arteries of your neck, the carotid bodies, switch on when oxygen falls and push you to breathe more. It’s why you breathe harder up a mountain without deciding to.

Your red blood cells do their part too. Each hemoglobin molecule holds up to four oxygen, and every one that sits down makes the next one easier, so the seats stay full across a big range of air. Healthy people at sea level sit at 96 to 98 in a blood test. The natural way to keep it there is mostly to stop getting in its way.

Is my number low enough to raise?

Probably not. In 33,080 Apple Watch wearers, a typical night at sea level for a 40-year-old ran about 93.5 to 98.4. The lowest moment of a healthy night goes lower still, and in 350 people with normal sleep studies it averaged about 90. A night average of 94 at sea level is lower than most people, and still inside the band for people like you.

From 95 up the seats on your red blood cells are nearly all full, so a 96 and a 99 carry the same oxygen. There’s no prize for 99.

What lowers a night, and by how much?

These are measured one at a time, so they don’t add up, and only some of them are yours to change. Here they are in the order we’d try them.

Skip the drink close to bedtime

In 14 trials with 422 people, alcohol before bed lowered the night’s lowest point by about 1.25 points and the average by about 0.6. Snorers got almost twice the extra breathing pauses of the group as a whole. In a 1981 study of 20 men with no symptoms, the extra oxygen dips were still there the next night with no more drinking.

That makes drinks the easiest thing to test. Three dry nights against three ordinary ones, on the same device, tell you how much it does for you. Does alcohol lower your blood oxygen? has the details, and alcohol.guide has what a drink does to the night.

Sleep on your side if you snore

If your airway narrows in sleep, lying on your back lets it narrow more. In 12,036 sleep-center patients with apnea, 66% had apnea that got worse on their back, and 28% had it only on their back. The people whose apnea depended on position had fewer pauses, about 24 an hour against 44, and better oxygen.

Side sleeping costs nothing and is easy to test for three nights. If you don’t snore, it probably won’t change much. Does sleeping on your back lower your oxygen? has more.

Lose weight if you snore and carry extra

Weight is the slow one, and for people with apnea it can be big. In a year-long trial of adults with obesity and moderate to severe apnea, people not using a breathing machine who took tirzepatide had about 25 fewer breathing pauses an hour, against about 5 on placebo, mostly through weight loss. On December 20, 2024, the FDA approved it as the first medicine for moderate to severe sleep apnea in adults with obesity, alongside eating less and moving more.

Can losing weight help sleep apnea? has the trial, and bodyfat.guide has the GLP-1 medicines and how to lose fat.

Don’t smoke

Smoke puts carbon monoxide in your blood, and carbon monoxide takes the same seats on your red blood cells that oxygen uses. A regular finger oximeter can’t tell the two apart, so the number can look fine while fewer seats carry oxygen. Your blood clears it once you stop breathing it in. Does smoking affect pulse oximeter readings? has the details, and lifespan.guide has what smoking costs you in years.

Go up slowly, and sleep lower when you’re up high

Elevation is the biggest thing on the chart. Every kilometre (3,300 feet) higher people lived took about 1.2 points off a typical night, up to about 8,200 feet. On a trip, where you sleep counts more than where you hike in the day, and the CDC’s rules for a trip are about pacing sleeping elevation. If you feel sick up high, going down about 1,000 feet usually helps, the CDC says. What happens at altitude and is my trip going up too fast? have the rest.

What doesn’t raise it?

Breathing harder doesn’t top up a healthy number. Your brain sets your breathing mostly by carbon dioxide, and extra breaths mostly blow carbon dioxide off. Deep breaths will raise your blood oxygen explains it, and breathwork.guide has what fast breathing really does and what mouth taping does at night.

We haven’t found good trials of bedroom plants, air purifiers or supplements raising anyone’s night number, so we’d leave them off the list.

When the low nights keep coming

If your lowest number keeps dropping under 90, someone has seen you stop breathing, or you snore loudly and feel sleepy in the day, the fix belongs with a doctor. A sleep study finds out whether your breathing keeps stopping, and a sleep doctor has treatments that work on the cause. When does a low night mean a sleep study? has the signs, and the three-night check gives you a card to bring.

Wear your watch or ring to bed, and Gyroscope shows last night’s blood oxygen beside your sleep every morning.