That might be part of the problem. .the want a dark place to roost.
However they need 14 hrs of light to keep laying. . So if your only getting 10 hrs of daylight. .you need 4 hrs of light in coop to get the 14.. most people add the extra hours in the morning. .waking them early
Chickens have there favorite spot. .so once they start with outside roosting.. only way to break it would be to remove it.. could it be the light inside they don't like? Maybe put on timer to come on early morning hours