I have 4 Orpingtons, 5 wyandottes, 2 light brahamas & 2 guinneas. At night, all are roosting & sleeping except the brahamas (also the youngest. They are 3 months old, the rest are 6 months to 1 year old). I never see the brahamas sleep at all. They are always walking around , making little noises, pecking at food, drinking water. There is no light except the stars from the windows & my flashlight. Is this normal for brahamas?
Just after dark, check their crops to see how full they. Mine do not roost tight when hungry if roost also in a location that tends to get dark to fast or has light pollution coming from a power pole or building.
Show a picture of roost area for young birds as well as the older birds. Insight might be provided by those images.