I agree that you should probably have him checked out by the vet.

If he is peeing on the bed just at night, you might consider a doggie diaper. I know that sounds terrible but these guys are a member of the family and if he is old they get special treatment.

We have a 14 year old female Lab and she takes estrogen twice a week for incontinence. We do know in her case that she just can't help it.

Everyone is entitled to their own opinions. If one doesn't have a pet as part of their family, it is hard to give advise. We wouldn't put a part of the family outside.
I agree that your boy dog seems to be stressed out from the bullying. Use baby gates to keep them separated. My Sam won't eat if Ruby is watching him. I use a baby gate from Walmart. Either of the dogs could easily knock the gate down but they don't. It would be a security for your boy to know that the girl can't get to him. A friend told me "they don't call girl dogs bitches for nothing". That is so true. My Ruby is very sweet but at times, she is a witch.

If you don't want to ban the dog from the room, I would keep the bed covered with a big sheet of plastic untill bedtime. I would hope that would discourage him until you can find a solution!

My dear old kitty was having similar problems. I figured out she was stressed but the other kitties. She now lives in the upstairs (where my bedroom is) and the others live downstairs. She is a happy kitty again and no problems.

It seems he is asking for help regarding his companions behavior.
He doesn't like to be picked on or bullied. I would seek some sort of behavior training for both dogs. Especially the more bossier one of the two. You and your husband need to show that you are "pack leaders" (your husband is alpha male and you are alpha female). Our dogs know this and act accordingly. Now Bella the mama dog is next in line, she runs the pen with an iron paw.

One of our sons has a cat, she pees on anything of his that doesn't move when she is mad at him. If the house isn't clean she pees, if his sleep cycle changes, she pees. He still hasn't figured it out even though we have explained it to him several times.
I agree don't keep him out of the bedroom if this is where likes to socialize with you and your husband. But keep it closed when you are not at home.

I keep my sewing room door closed because Kola and her invisible pal won't need to leave piles of hair all over my work and stash.

If you can't find a way to get him to stop then try "doggie diapers"..... Since it's a male just measure around his middle. Add 3 inches. Then measure from the hind leg to rib cage. Add 1/2 inch on each side for seam. This will be a rectangle shape when done. Using cotton fabric, cut 2 pieces. Sew them together, turn, close seam, edge stitch at 1/4 inch. On each end add velcro. It needs to be the width of the diaper. Line the diaper with ultra thin feminine pads(I use wal-mart brand), using the sticky side towards the cotton so it stays in place. You may need tro fold the pads wings in. Depends on how they're made. Hold the diaper, pad side up, under dog, wrap up & over dogs back, secure velcro. When putting this on your dog it needs to be snug. I've been using these for over 20 years on my dogs. I used to breed toy poodles & there's no way with 8 adult dogs as breeders, but in house as pets/family, that I could house break the males. The diapers are machine washable too. Each of my dogs has their own color. They have also never minded wearing them.

Older dogs often end up with weak bladder issues or kidney disease, which can take awhie, to show problems.

I agree about the vet. We had a black half siamese cat long ago who would let us know when he had kidney problems. He would go and pee in the sinks, so we would see the blood in his urine. Off to the vet we'd go (with him screaming at full volume in his Siamese voice) and after a few doses of antibiotics he would be fine for anther year or two.
Maybe your fur kid is hurting and can't get your attention any other way. Simply shut the bedroom door and see if he pees anywhere else inside.

Take him to the vet to get checked and ask questions.

As for your room, put up a baby gate to keep him out. That way you can still have your bedding on and it stays clean and dry without all the worry of where the dog is.

Hope you can get to the bottom of why this is happening.

Check out Patricia B McConnell, Ph.D. site: www.patriciamcconnell.com .. There may be something there for you.. I just picked up her short book "I'll Be Home Soon! on How to Prevent and Treat Separation Anxiety .. My flat-coated retriever Cooper has problems when I leave and I am reading the book and will practice what she suggests..

Everyone has great advice on here for you. I do know that dogs hate change, especially small territorial ones, so if you changed things up lately that could be it, moved his bed, changed it, changed furniture around etc etc