House rules concerning HD and HP

Few days ago I was thinking about gritty nature of the Barbaric Frontier. Since not everyday we wake up in a perfect condition I thought It would be aproprieate to cover this in the rules. 

Every day adventurers roll their HD. 

0 Hours of rest - all HD must be rolled

3 Hours of rest - 1 HD is full, the rest must be rolled

6 Hours of rest - 2 HD are full, the rest must be rolled

9 Hours of rest - All HD are full

Of course all wounds achieved must be substracted from the daily amount of HPs.

One hex map sheet

I've done this some time ago and I thought someone maybe will find it useful.