Look, who's snoring? How comfy are economy class airline bunk beds?

At one point, during my attempted nap, I dig out my phone and look up the dimensions of a coffin

- Tess McClure

A standard adult casket, it turns out, rises to 58cm (23in). Gazing up at the ceiling of my "nest", I calculate it offers about 7cm more clearance than the average coffin.

This is the Skynest: touted as a world-first design, it's a set of airborne bunk beds, created by Air New Zealand to "revolutionise" budget air travel. Available from next year, they will offer economy passengers the chance to stretch out in luxurious, horizontal style.

A snooze in one of the six beds - stacked tightly in pairs - will set the flyer back NZ$400-$600 (£200£300) for a four-hour session. The bunk room represents a challenge of engineering - fitting six horizontal humans into the space of a small airline galley.