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Deby Cassill in 2009 broke with tradition and calls certain periods of rest in ants sleep.. Working with fire ants, she videotaped ants in an artificial nest. She created an artificial colony with three queens, 30 workers and 30 larvae. Checking the posture and position of the antennae, she concluded that queens sleep 90 times per day for 6 minutes per nap, whereas workers dosed 250 times per day for roughly one minute at a time.
Worker ants are easily replaced by others that are indistinguishable from them. Creating a new queen, on the other hand, requires a considerable commitment of time and effort on the part of the colony. Fire ant queens live for years, while the lifespan of a worker is measured in months. Cassill and her team of researchers speculated that the poor sleeping habits of the worker ants could be part of the cause of their dramatically shorter lifespans.