First of all hello to everyone

Last week I went over at a breeder and fell in love with a 3 week old IRN. The breeder told us that if we take him at this age he will be more tame.
Anyways its been a week since we got this little darling. The first 3 days he was terrified of us but now he is comfortable around us. Loves being cuddled and he looks out for me when I am out of the room.
I keep him in a small box with wood shavings and cover the box to keep him warm, obviously, leaving air.
However I am very worried because he sleeps a lot. He doesn't cry to be fed or anything and I kind of have to make him eat. I give him warm formula from the pipette. I am really attached to this little bird and he seems too but I am worried something is wrong with him. Even when I hold him he sleeps. He practically sleeps all the time and I found no help at all from the breeder.
Please help

