Fatigue will chip away at your AP, but resting on a sleeping bag is only a temporary fix. You’ll also have to be aware of what beds you sleep on. The only way to cure your illness will be to craft antibiotics. Eating uncooked meat or unpurified water will increase your chances of getting an infection. Your character’s immune system is weaker, making them more susceptible to illness and addiction.
However, the most interesting changes include the addition of sickness and fatigue to Fallout 4. You’ll want to make sure you’re carrying the essentials, or risk injuring your character. According to the Reddit post, carrying too many items will take a toll on your back and legs. Some of the Survival mode changes include updates to combat, navigation, carry weight and more in Fallout 4. The user shared the alleged survival mode overview they extracted from in-game files on the Fallout subreddit. A Reddit user claims Fallout 4 ’s new survival mode details were hidden in the game’s files all along.