Every inch of your property will have even coverage and distribution of water. The watering will be timed and calibrated so there will be no wasted water. This eliminates evaporation of water to the sun. Another factor that makes this the best time to water is that it eliminates leaving your turf wet overnight. When you water in the late afternoon or early evening, you produce an environment that promotes fungus and mildews.
Water pressure is also at it's peak in early morning hours.
There is also little chance of any kind of tripping injury to anyone once the sprinkler head has retracted back into the ground. A Green Way Irrigation system is safe, efficient, and quiet. Which isn't good for your pocketbook or for your lawn. The solution isn't to use more water, but to water more precisely. An automatic sprinkler system takes the work and worry out of watering your lawn.