Have you ever seen birds taking a nap while perched on a tree branch or utility cable? Do you notice how they bow their heads slightly, but wake up quickly every few seconds or so, because of a noise?
Some older Chamorros use that image when they see someone dozing off while sitting up. Just as soon as their chin hits their chest, they snap out of it and lift their head. Only to doze off again after a few seconds. Again the cycle repeats.
The sight reminded them of the way birds do the same when they nap on tree branches and other places. Maigo' paluma. Bird sleep.
Maigo' paluluma este na palao'an.