If you ask 10 people how they sleep, you’ll get 10 different answers. “I’m a starfish.” “I’m a log.” “I sleep on my stomach with one leg out.”
Nick Littlehales is not a fan of this variety. In the R90 method, there is really only one approved sleeping position. The Fetal Position. On your non-dominant side.
Why Not the Stomach?
We’ve covered this before, but it bears repeating. Stomach sleeping is orthopedic suicide. It twists the neck, hyperextends the spine, and compresses internal organs. Just don’t do it.Why Not the Back?
Back sleeping is okay for alignment, but it is a disaster for breathing. Gravity pulls the soft tissue of the throat backward, narrowing the airway. This causes snoring and is the primary cause of Sleep Apnea. If you want to breathe freely (which is kinda important for recovery), get off your back.The Case for Fetal
The Fetal Position (lying on your side, knees gently pulled up) is our primal posture. It is how we developed in the womb. 1. Spinal Neutrality: With the right pillow, the spine stays perfectly straight. 2. Open Airways: The throat remains open, reducing snoring. 3. Brain Cleaning: Recent studies suggest that the Glymphatic System (the brain’s waste clearance system) works most efficiently when we are on our side. It literally cleans your brain better.
Why Non-Dominant?
This is the R90 secret sauce. If you are right-handed, you should sleep on your left side. If you are left-handed, sleep on your right side.
Why? Your dominant side is your “fighting” side. It’s the side you use to throw a ball, write, or defend yourself. It tends to be tighter, more muscular, and more sensitive. By sleeping on your non-dominant side, you are protecting your “weapon.” You are letting your active side rest on top, uncompressed. It also feels psychologically safer for the brain to have its dominant hand free to “defend” (a primal instinct).
The Pillow Check
The Fetal Position only works if you fill the Neck Gap. Lie on your side. There is a space between your ear and the mattress.
- If your pillow is too thin: Your head drops down. Neck strain.
- If your pillow is too thick: Your head is pushed up. Neck strain.
- The Goldilocks Zone: Your head should be perfectly aligned with the center of your chest.
How to Switch
“But I can only fall asleep on my stomach!” Habits are hard to break. But you can retrain your body. 1. Start in the Fetal Position. 2. Use a body pillow (or hug a regular pillow). This prevents you from rolling onto your stomach. 3. Persist. It takes about 10 days to reprogram the habit.
Your body wants to be in the Fetal Position. It’s natural. It’s safe. It’s restorative. Stop fighting gravity. Curl up, roll to your non-dominant side, and let recovery happen.
The Slumbelry Commitment
Sleep is the most vulnerable state of human existence. It is where we heal, reset, and grow.
At Slumbelry, we don’t just sell sleep products; we advocate for your physiological right to rest. From ergonomic support to light management, every solution we offer is designed with one obsession: Respecting your Biology.
Science is our language, but your recovery is our purpose. You take care of everything else in your life—let us take care of your nights.
Rest Deeply,
The Slumbelry Team
