Somnovolarism

Humans may dream of flying, but ambulating in sleep is necessarily earth-bound. By contrast, it has long been thought that some birds can fly while sleeping. For instance, in Walt Whitman ’s poem, “Thou who hast slept all night upon the storm”, he envisioned frigatebirds sleeping on the wing. Although animal tracking studies have confirmed that frigatebirds [1] and several other species [2] spend weeks to months flying non-stop, sleep in flight was only recently demonstrated fo r the first time [3].
Source: Sleep Medicine - Category: Sleep Medicine Authors: Tags: Images in Sleep Medicine Source Type: research