@DuchesssMom:
My new b (7 months old) growls very threatenly like yours. Also like yours, I don't press the issue. I do try petting, soft talk, and then try again, but usually let it go for awhile and try again. Sometimes in a couple hours I can get him moved from my bed to the crate, and other times he spends the night in my my bed. I haven't been bitten yet, but he has me convinced he would. We've only had him a few weeks, and hoping to over come it. My girl, Duchess, has NEVER growled in way with us.
You seem to be the only response on here that gets a convincing growling like I do. I have often read that some B's wake up grouchy, but this happens to me if he has just gotten comfortable not even asleep. So, I'm working on the problem hoping to over come it.
Get some treats, train him to hop off the bed, train him to go into his crate. The first time you try it, you may have to lure him off the bed with a treat (bribe). But soon after you should give the behavior a cue (or command) like off, or floor. And then you should be able to give your cue, and then reward with the food. At this point, start having the food reward out of sight of the dog (in your pocket). You may have to use something super special, like turkey or cheese. After he is getting down (or crating) about 90% of the time with the food present, start to alternate the food reward with an enthusiastic "good boy", or something else that he likes.
In my house, this level of growling at humans would be completely unacceptable. If he growls at you in your bed like that, there is no way that he should be sleeping there. Everytime he gets to stay, it confirms in his mind that growling works.