How do I play this exactly? Sanity/Light and Darkness - please explain

[Zoridium JackL]

yeah, your sanity will very very rarely go to clear, the highest it usually gets is slight headache, but it only really goes to clear at certain points in the game. and you don't really need to creep around crouching, just make sure to check your corners and you should be able to just sprint most of the time,