When one spouse has contributed towards the other's education, should the contributing spouse be "compensated" for that contribution?

If compensation should be provided, what kind(s) of alimony are most appropriate?

How should the value of the compensation be established?

Should it simply be assumed that each spouse will "contribute" to the other's welfare during the marriage? For example, let's say the husband has a serious back injury and is out of work for a year. The wife attends to his daily needs including bathing and dressing him, monitoring his medications, performing deep muscle massage on his back and legs, etc. When he recovers and divorces her, should she be compensated in some fashion for having taken care of him during his recovery?