What Is the Zero-Gravity Position on an Adjustable Bed?

The zero-gravity position raises your head and your knees at the same time, so your body rests in a gentle V with your legs slightly above your heart — a shape designed to take pressure off your spine and let your muscles fully relax.

Zero-gravity is a reclined position where the head and knees are both raised, leaving the torso and thighs open in a shallow V and the lower legs resting at or above the level of the heart.

It is not fully upright, and it is not flat — it is the relaxed middle position your body drifts toward when nothing is holding it up. On an adjustable base, it is usually a single preset or an easy manual setting: lift the head a little, lift the knees a little, and let the rest follow. The point is not a precise angle but the overall shape, which distributes your weight instead of concentrating it.

The position is modeled on what NASA calls the neutral body posture — the shape the human body naturally assumes when it is weightless and completely relaxed.

When NASA photographed astronauts relaxed aboard the Skylab space station, their bodies settled into a consistent posture: knees bent, hips open, arms floating, spine in its natural curve. With no gravity to work against, the muscles simply stopped bracing. NASA studied and standardized that posture, and its measurements have since shaped the design of everything from car seats to recliners. An adjustable base brings the same idea back down to earth — it uses the mattress angle to approximate, against gravity, the position your body would take if gravity weren’t there.

The zero-gravity shape does three quiet things at once — which is why it is the position most people reach for first.

It spreads your weight. Lying flat concentrates pressure at your hips and shoulders. Opening the body into a V distributes your weight across a wider area of the mattress, easing those pressure points.

It unloads the lower back. Raising the knees closes the gap that normally forms under the lumbar spine when you lie flat, so the muscles that hold your back all day can stop working and rest. Many people find this is what makes the position feel so relaxing.

It can make breathing feel easier. Lifting the upper body opens the space between the chest and the hips, which some people find lets them breathe more freely as they settle in.

Raising the legs also helps blood and fluid drain back from the lower legs, which is why the position can ease the heavy, tired feeling at the end of a long day. The Cleveland Clinic notes that elevating the legs above heart level helps reduce mild swelling.

Zero Gravity position on an adjustable base: Head and knees elevated for weightless support, back pressure relief, and better circulation:

On any adjustable base, you can reach a zero-gravity position by slightly raising the head and knees at the same time — many bases also include a one-touch preset for it.

There is no single correct angle. Start with a gentle lift at both the head and the knees, then adjust until your body feels weightless and settled — you will usually know it when your lower back and shoulders let go. If your base has a zero-gravity preset button, that is simply a saved version of this shape you can return to with one press.

Some people sleep in it comfortably; others use it to relax into sleep and shift out of it naturally during the night.

There is no rule here. Back sleepers often stay in a gentle version of the position all night. Side sleepers tend to use a milder recline or start in zero-gravity to wind down, then roll onto their side as they drift off. It is worth trying both ways and letting comfort decide. When you want to lie flat again, the base brings you back with a button.

A position is only as good as the mattress holding it — the surface has to stay supportive as it bends.

If a mattress sags or bottoms out in the V, the position that is supposed to relax your spine ends up misaligning it instead. A responsive mattress holds its support through the bend. It also helps that the base itself is built to live in the room: ours is wrapped in a cover made from organic cotton and stands on natural wood legs, rather than the bare steel most adjustable bases are built on. See Will an Avocado Mattress Work on an Adjustable Base?

It is a reclined position with the head and knees raised, so the body rests in a gentle V, the legs slightly above the heart. It distributes your weight evenly and takes pressure off the lower back. The name comes from NASA research into the posture the body naturally takes in weightlessness.

Many people find it eases lower back tension because raising the knees flattens the lumbar arch and lets those muscles rest. Results vary from person to person, and it is a comfort position rather than a medical treatment — see a doctor for back pain that is persistent, severe, or new.

Raising the legs above heart level helps blood and fluid drain from the lower legs, which can ease mild, everyday swelling and the heavy feeling at the end of the day. Persistent swelling or a diagnosed circulatory condition is a conversation for your doctor.

Raise the head slightly and the knees slightly at the same time until your body feels weightless and settled. There is no single correct angle — adjust to comfort. Many adjustable bases also offer a one-touch zero-gravity preset that returns to the same shape each time.

No. An anti-snore position mainly raises the head to help keep the airway open. Zero-gravity raises the head and the knees together for full-body pressure relief. They overlap — both lift the head — but they are set for different goals.