Maigo' (MY-go'): (pseudo-verb) Sleep, slumber, hibernate.
Note: Topping in his dictionary also gives the definition of "spin so quickly and smoothly that its motion is imperceptible." I've personally never used/heard it used that way, but if you have, let me know.
"Kao mamaigo' si Juan?" = "Is John sleeping?"
"Na'må'åse' i neni sa' ti siña gue' maigo'." = "The poor baby can't go to sleep."
"Manmamaigo' i famagu'on sa' pupuengi esta." = "The children are sleeping since it's already late at night."