Medium to medium-soft is best for most side sleepers, but the right firmness depends significantly on your body weight. Lighter sleepers (under 130 lbs) often need soft to medium-soft; average-weight sleepers (130–180 lbs) do best on medium; heavier sleepers (over 180 lbs) typically need medium-firm to prevent hip over-sinkage.

The engineering of the comfort layers matters as much as the firmness label — look for a mattress with a surface layer that yields specifically at shoulder and hip contact points, paired with a transitional support layer that prevents full hip sinkage and lateral pelvic tilt.

Yes. A mattress that is too firm for your sleep position will not absorb the concentrated pressure at your shoulder when you sleep on your side. This compresses the brachial plexus — the nerve network running from your neck through your shoulder — causing arm numbness, tingling, and persistent shoulder soreness.

The acromioclavicular (AC) joint is particularly vulnerable to this type of chronic compression. A properly engineered medium-soft mattress allows the shoulder to sink into the surface, distributing that load over a wider contact area and eliminating nerve compression entirely.

Yes, in two ways. A firm mattress creates concentrated pressure at the greater trochanter (hip bone), which can mimic bursitis symptoms and cause outer hip pain. A mattress that is too soft allows the hips to sink too deeply, creating lateral pelvic tilt — where the pelvis rotates sideways out of neutral — placing sustained strain on the lumbar muscles and lower spine.

The characteristic symptom of lateral pelvic tilt is lower back pain that is worst in the first 30–60 minutes after waking and gradually eases as you move around. The ideal mattress yields enough at the hip for pressure relief while resisting full hip sinkage past neutral.

Memory foam (viscoelastic foam) softens in response to both pressure and body heat, conforming to the shape of your shoulder and hip rather than pushing back uniformly. This distributes your body weight over a wider contact surface, reducing peak pressure at any single point — the mechanism that eliminates shoulder and hip pain for side sleepers.

Memory foam also isolates motion effectively, which matters for side sleepers sharing a bed who are sensitive to partner disturbance. High-density memory foam (3 lb/cu ft or greater) maintains these properties over time, whereas low-density foam degrades and effectively becomes firmer — recreating the pressure problem it originally solved.

Both have five foam layers, but the Original Premium adds an enhanced pressure relief layer specifically calibrated for shoulder and hip contact points. The Original has a uniform comfort layer at medium firmness (5/10), which works well for lighter side sleepers.

The Original Premium’s additional layer creates a softer-yielding zone at exactly the depths your shoulder and hip reach — medium-soft (4.5/10) — without letting the hips sink past the spine’s neutral axis. For most side sleepers between 130–230 lbs experiencing shoulder or hip pressure, the Original Premium is the meaningful upgrade that solves the problem.

Yes, with the right design. The Lull Luxe Hybrid and Luxe Premium use pocket coil systems beneath foam comfort layers, making them ideal for heavier side sleepers (180+ lbs) who need firmer hip resistance that all-foam mattresses can’t always provide at higher body weights.

The foam comfort layers still deliver shoulder and hip pressure relief, while the coils provide responsive support and airflow for temperature regulation. Hybrids are also a strong choice for combination side-and-back sleepers, since the coil system supports both pressure profiles more responsively.

Yes. A mattress that’s too soft for a side sleeper allows the hips to sink below the spine’s neutral lateral axis — a condition called lateral pelvic tilt. This reverses or flattens the natural lumbar curve, placing the lumbar erector muscles under sustained eccentric load throughout the night.

The characteristic symptom is lower back pain that is worst in the first 30–60 minutes after waking and gradually eases as you move around. Heavier side sleepers (180+ lbs) are most vulnerable to this problem on standard medium mattresses.

Combination side-and-back sleepers need a mattress that accommodates two different pressure profiles. Back sleeping distributes weight more evenly and requires firmer support; side sleeping concentrates pressure at the shoulder and hip and requires yielding. A medium feel (5–6/10) is often the best compromise.

The Lull Original Premium is ideal for combination sleepers who spend more time on their side, while the Luxe Hybrid is better for those who run warm or are heavier (180+ lbs). Both provide the balanced feel that serves both sleep positions well.

Significantly. Body weight determines how deeply you compress any given foam layer. A 130-lb side sleeper on a medium mattress sinks to a comfortable depth with good pressure relief. A 200-lb side sleeper on the same mattress compresses the foam more aggressively — potentially allowing the hips to sink past neutral alignment.

Heavier side sleepers (180+ lbs) generally need medium-firm or a hybrid construction to achieve the same effective support that lighter sleepers get from a standard medium. Our body weight firmness guide above provides specific recommendations for each weight range and body type.

The brachial plexus is a network of nerves originating in the cervical spine (neck) that passes through the shoulder, under the clavicle (collarbone), and down the arm to the hand. When you sleep on your side on a firm mattress, the concentrated pressure at the shoulder can compress this nerve network — causing arm numbness, tingling in the fingers, and a “dead arm” sensation that wakes you during the night.

Chronic compression also contributes to persistent shoulder soreness at the acromioclavicular (AC) joint. A mattress that allows the shoulder to sink adequately relieves this compression entirely — making the right mattress firmness a functional medical consideration, not just a comfort preference.

Most side sleepers have a clear sense by 30 nights. The first week involves adjustment as your body adapts to the new surface and the foam begins to break in. By weeks 2–3, any persistent pressure pain, numbness, or morning soreness is meaningful signal rather than adjustment noise.

By night 30, the mattress is fully broken in and any remaining issues are structural. Lull’s 365-night trial gives you a full year to be certain — but for most side sleepers, the verdict is clear within the first month.

Yes. If you have a pre-existing shoulder injury — rotator cuff damage, AC joint separation, bursitis, or post-surgical recovery — the Lull Original Premium and Luxe Premium minimize shoulder contact pressure by allowing the shoulder to sink into the mattress surface, distributing load and eliminating the focal compression that aggravates injured tissue.

For acute or post-surgical shoulder injuries, the Luxe Premium offers the deepest comfort layer stack and maximum pressure distribution. We recommend consulting your physician about sleep position restrictions, but from a mattress engineering perspective, Lull’s pressure-relief construction is appropriate for shoulder injury recovery.