Sleep and Paradoxical Sleep in Ruminants.
This study proved that ruminants have the physiologic capacity for sleep and paradoxical sleep. Daytime ruminant sleep in goats was transient and polyphasic, averaging 5.1 ± 0.6 minutes per episode. The frequency was variable, ranging from 0 to 6 episodes during daytime. In addition, the goats exhibited paradoxical sleep, known as dreaming in man, with average durations of 5.5 ± 0.4 minutes. Rumen contraction rates apparently had no causal relation to behavioral states, but rather were a consequence of the animals' state of alertness.