Can it center under the window?

No. The bed has to be exactly where it is. The entire room is very long and skinny. Between the Tilted ceiling and the an weird corner where our chimney is I can’t move it at all.

If I move the bed anymore to the left I can not walk to the left side of the bed.

You could hang curtains behind the entire bed to even it all out or add a statement piece of art next to the window above the bed and embrace the asymmetry.

I can’t do that because of the tilted ceiling

Find fabric you love and make drapes that hang floor to ceiling and are nice and full. Then "paper" the walls with the same fabric using the starch recipe below. Pattern should be medium sized. Replace your lamps which are too short and squatty.

https://www.apartmenttherapy.com/how-to-make-removable-fabric-w-74483

Change the curtain to one that blends into the wall (or a blind). Put some art, artfully [ :) ] arranged above the bed to balance the space. Get creative with what constitutes "art". More than one smaller piece would take the shape of the slanted wall better than one large piece.

As Tara suggested, create balance with art.

Or use wallpaper to take the focus away from the asymmetry.

Chelsea Penthouse · More Info

Have you tried turning the bed to the sloped ceiling wall? I realize tall people might not be able to use it comfortably, but maybe it could work for you. Much would depend on the actual height of the short wall and the jog on that other wall. I feel your pain. Our first house had even shorter ceilings with both sides slanted. We could barely stand up in the center of the room!

Personally I might consider embracing the asymmetry with mismatched lamps and/or mismatched nightstands. You could balance the curtain with artwork to the right of it to visually fill that space with equal weight. Instead of balancing with art, if there is enough room you might consider running the curtain rod and curtains all the way behind the headboard beyond the window to make it appear as if there was a window across the whole wall.

Here's our room. We just blended everything in so that the offset window wouldn't stand out so much.