I am a fairly new chicken owner and have a questions. The chicks we have are 5 1/2 weeks old, about 3 days ago I took away the heat lamp and ever since we have had a hard time getting them into the coop at night. Tonight we had to pick up the sleeping chickens outside and put them into the coop. Is there something we should be doing to make them want to go in the coop at night? Was it to soon to take the heat lamp away?