My flock is 6 weeks old and still cuddles together on the ground at night even though we have plenty of roost bar/space for them in the coop. During the day they roost and sleep on the roost bars out in the enclosure and will even go into the coop and nap on the roost bars but once night hits they refuse to roost and cuddle up. Is this normal (I'm a newbie to chickens)? When should they start roosting at night? Are there any tricks to get them to roost?