Dozing

[Bert Preast]

Sleeping replenishes vigour, but there are times when one cannot or does not want to sleep.  My suggestion would be to add dozing, representing sitting or laying with eyes closed and mind drifting.  The effect would be to pass time while maintaining the current level of vigour where it is.  It would save holding down the "." key to pass time, and should last until the next time period or until a change in the weather.

I would find it very useful when travelling long distances with only a stone axe or knife, where building a shelter can take so long that I prefer to sit quietly under a tree and wait out the rain.  Also when waiting for the next tanning stage, or waiting for the sun or moon to improve visibility before pressing on.

Being too cold should prevent dozing, in the same way that it prevents sleeping.  Lay down for a nap when you're that cold, you never wake up! 

[Roth]

you can press the "-" key to pass time much faster, or SHIFT + "-" (so "_") to pass time until your fatigue goes down to 0.

[Bert Preast]

Yes but waiting costs vigour, while dozing would not.

[Fineland]

So you pretty much want a midday siesta in Finland?

[Bert Preast]

I believe all advanced peoples enjoyed siestas...  but then civilisation arrived 

[Fineland]

Now that I think about it you can achieve around 1 hour sleeps. You just have to be starving...