According to this, the sleep is very short indeed, done only while gaining altitude, and only done with one side of the brain at a time! https://www.audubon.or

According to this, the sleep is very short indeed, done only while gaining altitude, and only done with one side of the brain at a time! https://www.audubon.org/news/scientists-finally-have-evidence-frigatebirds-sleep-while-flying https://www.audubon.org/news/scientists-finally-have-evidenc...