Best Campervan Sleeping Setup UK: Mattresses, Bedding & Insulation

Introduction

A good night's sleep is the difference between enjoying van life and tolerating it. In the UK, the challenge is the damp-cold — it seeps up from the floor, condenses under your mattress, and turns a cheap foam mattress into a damp sponge within a few weeks. Getting the sleeping setup right means understanding how insulation, airflow, and materials work in a small metal box that changes temperature by 15°C between bedtime and dawn.

R-Value Explained for the UK Climate

R-value measures how well a material resists heat transfer. The higher the number, the better it insulates. For a campervan sleeping platform in the UK, you want an R-value of at least 4.0 for comfortable spring and autumn use, and 5.0 or higher if you plan to sleep through winter. Standard foam mattress toppers have an R-value around 1.5 — not enough to stop the cold from the van floor creeping into your back.

Look for mattresses that list their R-value clearly. Self-inflating camping mats (Therm-a-Rest NeoAir, Sea to Summit Comfort Plus) often have R-values of 4.0-6.0 and work well as a sleeping layer on top of a permanent foam mattress. The downside is they need inflating every night and deflating in the morning, which gets old fast in a van.

Memory Foam vs Sprung Mattresses

Memory foam is the most common choice for DIY campervan builds because it is easy to cut to shape and does not need a bulky sprung base. The key specification is density — 35-45 kg/m³ is the sweet spot for van use. Anything lower than 30 kg/m³ compresses too quickly and does not support side-sleepers. Buy a full-size slab from a specialist foam supplier (Foam for Comfort, The Foam Shop) and cut it to shape with an electric carving knife. A 10cm thick slab of 40 kg/m³ memory foam costs about £60-£100 for a double bed size.

Pocket-sprung mattresses are more comfortable than foam for most people because they breathe better and do not trap heat. But they are harder to cut to non-standard shapes, thicker (15-20cm minimum), and heavier. They are a better choice if you have a fixed bed base and do not need to move the mattress frequently.

For a mid-range option, hybrid mattresses with a foam base and a sprung top layer combine the best of both. Brands like Duvalay sell campervan-specific versions in standard UK widths (double, king, single) that fit most van bed layouts.

Bedding Layers for British Weather

The UK's climate is damp and variable, so a single thick duvet is the wrong approach. Instead, layer your bedding: a cotton or bamboo fitted sheet, a 4.5 tog duvet for summer, a 10.5 tog duvet for spring and autumn, and a wool blanket or second 4.5 tog duvet for winter layering. This allows you to add or remove layers as the temperature swings.

Merino wool blankets are excellent for van life — they regulate temperature, wick moisture, and do not hold smells. A British army surplus wool blanket (£15-£20) is a budget alternative that works just as well as expensive camping brands.

Condensation Under the Mattress

This is the most common sleeping problem in UK campervans. Warm moist air from your breath and body rises, hits the cold van floor, and condenses underneath your mattress. Over time, this creates black mould on the underside of the mattress and a musty smell throughout the van.

The fix is a ventilated base. Do not lay the mattress directly onto a solid plywood bed base. Instead, use a slatted base (IKEA bed slats cut to size), a wire mesh, or a breathable grid like the Campervan Mattress Base system. This creates a 10-15mm air gap under the mattress so moisture can evaporate rather than pooling.

Failing that, flip the mattress every week and air the underside when you pack up. A mattress protector (breathable, waterproof) also helps keep moisture out of the foam. Vacuum the plywood base occasionally to prevent mould spores taking hold.

Conclusion

Choose a memory foam mattress with 40 kg/m³ density or higher, aim for R-value of 4+, layer your bedding with different tog duvets, and ventilate the underside of your mattress with a slatted base. Get those three things right and condensation stops being a problem, the temperature stays comfortable across seasons, and you wake up rested rather than damp and cold.