For the 380, hammocks.
They were good enough for the lower ranks in Admiral Nelson's days. I believe TC got the idea after watching Russell Crowe in 'Master and Commander'.
He concluded that if crews who'd spent the night sleeping in such conditions for months on end could defeat the Fench in the southern Indian Ocean, his crews could fly across the same ocean resting in the same style of bed.
Cheaper - and lighter - too, so less fuel uplift.