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You'll probably put up with a little discomfort during a sleepover.

You'd rather have your arm fall asleep and wake up a little wonky than upset the delicate post-coital balance you've achieved.

But why should you have to?

Boing Boing looks at the prototype for a new kind of mattress, created by designer Mehdi Mojtabvi that includes cushioned slats for you to stick your arms and feet into in order to be able to hold your lady and not wake up with a dislocated shoulder.

Mojtabvi suggests awkward sleep positioning can cause "radial neuropathy," which results in "weakness in wrist dorsiflexion (i.e., wrist drop) and finger extension." The article rightly notes that the design would seem somewhat difficult to keep clean, with lots of deep crannies that aren't particularly suitable for a set of sheets.