A bed is a piece of furniture which is used as a place to sleep or relax. Most modern beds consist of a soft, cushioned mattress on a bed frame, the mattress resting either on a solid base, often wood slats, or a sprung base.
Thank you for your question. This in itself is not a valid reason for divorce, however, in this situation it may be wise to seek relationship counsilling if it is bothering you a lot.
May you always be successful
It depends on his real ability and the extent of it. Every Muslim is responsible to perform his worship in the proper way as far as he can. If there is a real inability, then what ever is possible for him is obligatory on him. If he can not stand at all, then he can pray while sitting, but if he can stand for a while then unable to continue standing, then he has to stand for Takbiratul Ehraam and what ever he can, then when he feels unable to continue, he can sit. If he can sit and pray, he can not then pray lying on bed unless he reaches to a stage that he can not sit. Standing is must as far as it is possible even part of it. Same with sitting for those who are unable to stand, then lying on bed for those who can not sit either at all, so they sit, or some times, so they sit according to their present ability.
Rokoo' and Sojood is performed also according to the extent of the ability.
It is the etiquette of Islam that beds are not shared with someone of a different gender, whether they be related or not.
In this particular situation, it would be better to sleep in the same room, but on a different bed, or alternative options.
And Allah knows best.
It is recommended for the wife to sleep with her husband touching his body, and for the husband to be kind and gentle with his wife always specially when they are sleeping together . The side which is usually recommended for every one to sleep on is the right side of the body but for husband and wife sleeping together, they should sleep is the way which suits both of them. Husband should not give his back to his wife, nor wife should give her back to her husband.