Is there any lights on anywhere near his coop at night? Any light such as a neighbor's outside light? A nearby room light? If there is no lights around that he may see, does any of your neighbors have roosters that might be seeing a little bit of light? All it takes is one rooster to crow and you have a whole neighborhood of roosters crowing in the middle of the night. As far as crowing all day, any rooster will crow all day. You actually want a crowing rooster all day cause it lets you know that things are good on the farm.