We Asked an MD if Knee Pillows Really Help Back Pain. He gave us the 7 reasons why it's becoming the new choice for side sleepers.

“There are two categories of back pain: mechanical and inflammatory.

Mechanical is where most everyday aches fall — muscle strains, sprains, sports injuries.

Inflammatory is caused by increased pressure in your lower back; your body inflames the area to protect it, and that causes pain. That's where side sleepers' pain comes from. When you sleep on your side, your top leg pulls your whole body out of alignment, putting pressure on your lower back. Years of that cause strain — and inflammation is how your body protects itself.”

Sleeping on your side keeps pressure on the lower back, and your body sends signals to protect it. But over time this affects your spinal cord — the main nerve in your back — and can cause flexibility loss, persistent fatigue from lack of sleep, and chronic spinal misalignment.

These are long-term side effects of side sleeping. But remember: the pain is a sign you're doing it wrong — not that you have to change your sleeping position.

When you rest, inflammatory chemicals and cells pool into one area and the spine becomes inflamed. When you move, all of that spreads evenly through your body — which is why the pain fades.

That's why you find yourself pacing the room at 2 a.m., trying to walk off the pain and fall back asleep before it returns. The resting period that's supposed to bring relief is actually making the problem worse.

He told us: “The solution is simpler than you think. Multiple medical professionals, me included, are recommending knee alignment pillows.”

I asked why. “These pillows align your spine and evenly distribute the pressure through your whole body while you sleep — so your spine is actually in a healing position. I have one at home, and it's genuinely comfortable.”

"A simple pillow is going to get rid of my debilitating back pain at night?" Yes — the solution really is that simple.

You don't have to spend $3,000 on mattresses, doctor visits, or prescription pills. You simply need to spread the pressure evenly through your back while you sleep on your side. Put the right pillow between your knees and, all of a sudden, your spine sits in its natural position. There's no longer pressure building in one single spot — everything distributes evenly, and the inflammation calms down. That's it.

The MD said the Aline pillow is the best commercial pillow you can get that actually fits any side sleeper. Most pillows you buy on Amazon or other websites don't really fit — some are too tall, too soft, or too hard.

That's why it's best to go with something you know works. They're also currently running a 100-night guarantee, which is a good deal if you're in the market for one.

It's not just a stiff back — it's the lack of sleep that's wrecking your day-to-day life.

I always tell side sleepers: “Remember those college days when you'd sleep 4 or 5 hours and wake up feeling brand new? Now you go to bed at 9 p.m. and can barely get out of bed the next morning.” Good posture at night can bring you back to those days — so you'd better take care of it.