The debuffs you get in survival were a bit weird, why is not drinking for a few hours make me lose intelligence ? Why should I lose health just for skipping a meal ? and why would anything make me lose luck ? So I've decided to make a few changes: 

1- Thirst relates mainly to your activity and stamina: 

- Parched: AP regeneration is 5% slower (you're a bit out of breath).
- Thirsty: AP regen is 15% slower, -1 Agility (you really need a drink now).
- Mildly Dehydrated: AP regen is 30% slower, -2 Agility, -1 Endurance (you've gone too long without water it's starting to affect your health).
- Dehydrated: AP regen is 45% slower, -4 Agility, -2 Endurance, and you can't sprint.
- Severely Dehydrated: AP regen is 60% slower, -8 Agility, -4 Endurance, and you can't run.

2- Hunger makes you grumpy, but it's mainly about your physical strength:

- Peckish: -1 Charisma (you're just a bit grumpy).
- Hungry: -2 Charisma, -1 Strength, -1 Endurance (It's been half a day without sustenance, you start feeling the physical effects).
- Famished: -3 Charisma, -3 Strength, -3 Endurance.
- Ravenous: -5 Charisma, -6 Strength, -6 Endurance.
- Starving: -8 Charisma, -10 Strength, -10 Endurance, and periodic damage.

3- Sleep: Not sleeping now affects your concentration before affecting your physical abilities:

- Tired: -1 Intelligence, -1 Perception.
- Overtired: -3 Intelligence, -3 Perception, -2 Strength.
- Weary: -5 Intelligence, -5 Perception, -4 Strength, -1 Agility.
- Exhausted: -7 Intelligence, -7 Perception, -6 Strength, -3 Agility.
-Incapacitated: -9 Intelligence, -9 Perception, -8 Strength, -5 Agility.