I was recently sleeping while out hunting, I had about 95 stamina and I tried to wake up but got the 'youre too tired right now" and for no reason typed in 'sit'. Well, either this was a coincidence or typing in an action command will give you back 20 points for your stamina. So, I tried it again and BAM another 10 stamina back. Is this just a bug or what?
No, that's just a coincidence. :) Sorry.
If you test it continually and get the exact same results, especially without a space of time between entries, then you have something. One episode is a little less reliable.