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Dogs that do not like either humans or other dogs near valued items are considered possessive aggressive. This means that anything they view as a valued item belongs to them and anyone that tries to take it will be warned and possibly bitten.
When we have possessive aggressive dogs, we do have to do certain training. This training is done daily but it is fairly simple and you can do it at home.
Clicker training in general obedience to establish your role in the home and to show the dog you are consistent in what you expect from him. I would train in short sessions, ten minutes, but do this several times a day as your schedule allows.
I would definitely work on the command off, and get your dog off the bed with commands rather than try to move him and I would train a 'default behavior' of him going to his own bed and staying there when you sit or lie in yours.
The learn to earn program goes along with the daily obedience training. This just means that you are now going to control everything in the dog’s life, his wants and needs. The lead dog of a pack keeps everything for themselves and only shares when they want to. This means that you no longer will put a full bowl of food in front of him but you will use his food as a training reward. This shows him you have control over needs, then you are going to put all toys , bones etc,. away and you will decide when he can have them and when he can play with you. This shows control over wants.
I am going to direct you to sites to take you through the clicker training . You want to get these commands down very well, Off, down stay, sit stay, and go to bed.
It does take time to train and that is why I want you to do it in shorter sessions rather than a long session, dogs seem to stay focused more in shorter sessions.
Clicker training/positive method training/ print off
video’s to see how clicker training is done, scroll down to videos http://www.clickertrainusa.com/clicker-training-videos.htm
clicker maintaining focus http://www.clickertraining.com/files/auto-eye-contact.pdf
Dr sophia yin learn to earn https://drsophiayin.com/blog/entry/the-learn-to-earn-program/
Here is an example of what a default behavior looks like https://www.youtube.com/watch?v=kfYAQM7B5vw&feature=youtu.be
Of course the easiest thing to do would be to reintroduce the Crate and train him to go into the crate at night, but I do feel that with your husband's passing the dog may try to take over in other areas as time goes on.