Dozy cows

Do dairy cows need to sleep more? This question is being asked by researchers at the Swedish University of Agricultural Sciences. We know that sleep-deprived humans use more energy than when they get sufficient slumber, but the effect has so far not been investigated in cows. There is particular concern that high-yielding dairy cows housed in free stall systems could be disturbed by this industrial environment to such a degree that they fail to get enough sleep.