Nap Stack and disease frequency

[CataclysmicOreo]

If a character has a disease, bubonic plague for example, nap stack allows them 4 checks to cure themselves for 8 hours of sleep as that 8 hours counts as 4 days per the spell.
Does that also mean bubonic plague triggers its effect 4 times as it has a frequency of 1/day? It's a little vague in the spell description and it wouldn't really make sense to me if sleeping better somehow also sped up the spread of a disease, but one of my players thinks this is how it works so I thought I'd check.

[Darkblitz9]

I believe it does count for both positive and negative effects, as per this line:

" If things go poorly they can, at any time, wake themselves up in order to seek a better alternative."

Essentially, Nap stack accelerates time for that person during sleep. This allows for a quick succession of saves against disease, but if their relative save isn't high enough, and they get worse, they're allowed to wake up to seek alternative means of curing the affliction.

I imagine that unless the affliction can get worse by failed saves, there's no reason to include the concept of things "going poorly".