I let the girls out every night at 7pm for them to range before bed. At 7:45 Olga goes RUNNING into the run and jumped in the coop and headed for a box. Everyone went in to roost about 8:10 and she was still on the nest. I went out at 8:30 (full dark) and she was still on the nest. I turned the light on and got the egg and pushed her out of the nest. She jumped up on the roost and went to bed....lights out. I have never heard of a hen laying that late at night, is that common?