Sorry but wall to wall mirror in a bedroom IMO is just plain tacky. I would cover the whole thing with drapes to match the window drapery.

I would have them removed immediately. Mirrors are not a headboard. You can add a beautiful headboard to the wall, night stands and art.
A mirrored wall in a bedroom is tacky. Maybe the previous owner had kinky taste, but leaving those mirrors may reflect questionably on you, pun intended.

For arguments sake, I'll throw in an opinion in support of the mirror: Yes, they are relics of the past, but used correctly, they can dramatically open up a space. Believe it or not, I once designed a transitional space around a wall to wall mirror and it turned out great. Three things helped: First, making sure there were no other visible mirrors in the space to avoid the funhouse effect; Second, framing the mirror in a way that made a statement. I like the idea that was mentioned of using moulding; Third, keep the rest of the design pretty understated. The mirror is large and you don't want 50 other elements competing with it.

Personally, I like bedrooms to feel cozy, so I probably wouldn't keep a wall to wall mirror in a bedroom, but if you're attached to it, these are some ideas for getting it to work.

Another vote to take down the mirrors here. That being said, if you like them or it isn't feasible to remove them, then I'd get a large upholstered headboard. Something really tall and plush. You need to add softness to the room.

They are a stand alone feature. No DECORATING necessary. What a nightmare that room would be. I guess be glad they are in a bedroom not a livingroom like was done MCM style.