Coop design question from a newbie

[Sunnysimplelife]

We have four two month old chicks and we took and old cupboard and turned it on its side to make a house for them. It is fully enclosed in the run. The question I have is I have the top with the ramp set up for laying boxes and the bottom part for them to sleep in at night. It is just about ground level with a roosting bar running across it but raised on paving stones. They do not go in on their own at night, I have to scoot them in. They quiet down right after I put them in and close the door but is it against their nature to sleep so close to ground level or am I over thinking this and they will eventually realize this is where they go at night?
Thanks for all the answers to my questions.

 

[Nickichicki]

my hens always sleep as high as they can get!. Chickens are descendants of jungle fowl and I believe they feel safer up high at night but I am not sure. I would look into the matter ASAP so your chickens are feeling safe at night! I know I wouldn't be sleeping well if my ladies were not feeling secure.... Hope you get it all worked out!