We got our (now 12 week old) boxer about three weeks ago and were nervous new parents about having him sleep in the crate. We felt so guilty about it and wanted to go running every time he made a noise!
For the first week, we kept the crate in the kitchen but slept on an air mattress in the next room so we could talk to him and take him out often. But he cried a lot.
Then we tried moving the crate into our bedroom and letting him fall asleep with us, then moving him into his crate when he was asleep. He barely opened his eyes and didn't mind the move at all! After a week of that, he's been going into his crate at night on his own when we are getting ready for bed.
He still doesn't like it much when we close the door, and will often place his head down on the door opening so we can't close it without disturbing him, but other than that he's really taken to the crate well.
In fact, when our nieces and nephews were over for a visit, he was a little overwhelmed by the activity and several times went into his crate to hide out! It's his very own little safe hiding spot.
Riley: born 9/6/00, brindle male, natural ears, spoiled rotten!