So you have 0-1000 points of Dehydration, Starvation, and sleep deprivation 0-199 is normal levels and after that you start facing penalties.
200-399 Minor Dehydration : -1 End, Dark Hud
400-599 Advanced Dehydration : -1 per, -2 end, Light Hud
600-799 Critical Dehydration : -1 per, -3 end, -1 int, Red Hud
800-999 Deadly Dehydration - -2 per, -3 end, -1 agi, -1 int, Pulse Red
1000+ Death
For starvation the same scale is applied however it effects mainly strength and charisma, for sleep agility and intelligence are the main stats penalized.
Source : NV Strategy guide
hardcoe mode sounds great!
EDIT : Starvation
200-399 Minor Starvation: - -1 Str, Dark Hud
400-599 Advanced Starvation : -1 chr, -2 str, Light Hud
600-799 Critical Starvation : -1 per, -3 str, -2 chr, Red Hud
800-999 Deadly Starvation - -2 per, -3 str, -1chr, -1 int, Pulse Red
1000+ Death
Sleep Deprivation :
200-399 Minor Sleep Dep : -1 agi, Dark Hud
400-599 Advanced Sleep Dep: -1 inta, -2 agi, Light Hud
600-799 Critical Sleep dep : -1 end, -3 agi, -2 int, Red Hud
800-999 Deadly Sleep dep- -2 int, -3 agi -2 end, - Pulse Red
1000+ Death
