I became the owner of four RIR pullets five days ago. My girls won't come out of the coop to grass feed. They will walk around for maybe five minutes then go back in the coop. They are sleeping on the roost at night but laying in their nesting boxes MOST of the day. I was told they will start laying eggs any day now. Why will they not come out of the coop? Why are they sleeping in the nesting boxes most of the day? The coop has doors and windows, should I install a light too? Please help me!