Unless something else happened in the meantime, Sky should have healed a bit in the time since he wandered off. Two nights, so I'd assume he was at 6 HP, and now down to 2.
To answer the question Red, if you don't have any other source of healing, when you sleep you recover 1 hit point per hit die you have, or 2 if resting in comfortable conditions (Like an inn) Sky just has 1 HD right now, so he recovers 1 HP per night while out in the wilderness.
Yes, it's very slow, hence why most parties don't go anywhere without a good source of magical healing.
[By The Way], if you get to 0, you're usually staggered, which limits what actions you can take. If you get to -1 or less, you're unconscious and probably bleeding out. Every round while bleeding out you automatically lose 1 HP untill you are stabilized. You have a 10% chance of stabilizing each round without assistance. Magical healing automatically stabilizes you, and someone performing a Heal skill check can do the same. But if your health ever reaches -(Your constitution score), your character dies.
Normally you are correct Bastion but in this case since he did not update his character sheet he is unconscious from a fall. Yes he will wake up later and be where he needs to get some rest. This is one of the issues if one does not keep their character sheet updated.
Thankyou for clarifying my query and I will be working to update Sky's character she's for all his change's I think at most right now I is just his health I need to work out correctly I'm just glad our kind GM didn't have him break a wing or something.