One of my dogs began doing the same thing when he hit about 6 months old. I took as a sign that he found his crate to be a positive/good place and wanted to sleep their not to get away from us but because it was "his spot."
I think that because of his training, he respects me and my fiance as his masters. That makes him happy and that is why he chooses his bed or crate over our bed.
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