As hunger, thirst or sleep deprivation increase, the player is notified by periodic sound effects.
These effects kick in shortly before the first penalties occur, so the player is given a chance to eat, drink or sleep in time.
Extracted from Project Nevada:
“You may upload Project Nevada to other sites, convert it to work with other games, modify anything or release bug fixes and improvements, and use our assets without permission, but please give proper credit if you do so.” – Project Nevada readme.
Works only in Hardcore mode.