Time Sense

The character witii this proficiency has an inner clock which ailows him to keep track of the time without the aid of devices or astronomical sightings (the sun or stars). A successful check means that the character can estimate the time passed since the last verifiable time check within 3d10 minutes.

For every 24 hours that the character is without a verifiable source, this check must be made. Failure means that the character is off by 1-2 hours. The character knows something is wrong, but that's still his best guess. Subsequent checks are made using previous guesses as a base.

This ability can also he used to awaken at a certain time.  An additional -1 modifier is applied when attemptng this. Failure means oversleeping by one hour for every point by which the check ls missed (up to four hours).