i do that too!
i find i just can't sit and relax until they are in, the day is just not complete until its a job done.
i have forgotten to close the bob hole before though, and had a surprise in the morning when they are out in the run when i get up! the run is fully enclosed and is really just a dog free feeding area for them, but still, i feel like a bad mother thinking they have had the draught from it being open all night.