Yep, it's real, but IMO only makes sense for adults living alone. Utterly useless if you have kids.
If it could be made "police cruiser style", where it locked, preventing a shotgun from being pumped, or the trigger and safety manipulated, but could be quickly accessed with a combination like the GunVault product, color me interested.
GunVault did have something like that, but not for beds, sort of a hardened "George Foreman Grill" that clamped over the shotgun's receiver, but I guess it didn't sell well.