Basically, increasing karma comes from being nice in scenes that check for a change in that value.
Editing karma itself - don't bother. It is - as far as I'm concerned - way easier to cheat-edit an action like sleep.llpaction.
Add something like karma +30 (END) to the Effects using notepad++, and voila, your karma increases after sleeping. Until the next game update overwrites it, at least. Then you have to edit again.
Line should read something like this:
EFFECTS: mood +30 (END), karma +30 (END), fitness +0.02 (END), intelligence +0.01 (END), attractiveness +0.01 (END), energy +80 (DURATION), mood -10 (INTERRUPTED), intoxication -100 (DURATION)