A bedroom is the one room that should pull you in and quiet you down, and sage olive does exactly that. Think of olive as green with the cool blue dialed out and a little earth dialed in, so on the walls it behaves like a warm neutral that just happens to be green. In morning light it leans soft and gray, and by lamplight it deepens into something close to a forest floor.
Around it, warm linen keeps the room from feeling closed in, and a cleaner soft chalk on the trim and ceiling gives the olive a crisp edge to sit against. Walnut brown in the floor and a nightstand grounds the whole scheme with real wood warmth, the same family of brown pigments already living inside the olive.
For the one moment of depth, bring in smoked plum on a headboard or a single panel behind the bed. It is a dusty, grayed purple that flatters olive the way a bruised plum sits next to a green leaf. Keep it to that one surface, no more than about a fifth of what your eye sees, so it reads as a quiet anchor instead of a second wall color.