Flat Beds in Economy Class: Concept from Delft University of Technology Students

Delft University of Technology design students have come up with an economy class lie flat bed that has a generous length. They would be converted to an upright seating position for three people, thereby ensuring safety during taxi, takeoff and landing.

The way it works is by allowing the middle bed to slide up to the top, while the bottom bed folds in half to provide seating for the passengers. This way, all three passengers sharing this special seat can enjoy lie flat comfort during the cruise portion of the flight.

Also:

https://www.tudelft.nl/en/2020/io/february/flying-v-beds-nom...

https://youtu.be/LZ_Yi-Nni4U