It really depends on your furnishings, fabrics, curtains, floors...I say go for it! If you hate it after awhile you can easily repaint.

I am going to paint mine BM Silken Pine, BM Winter Gray or Dreamy Cloud is nice for grays

Pic of the master bedroom in our house from when we first toured it as prospective buyers. The windows, to the left, face north/northeast. This was a cloudy day in the dead of winter. Note how bright it is (pretty sure the ceiling light was not on). I really don't think sage would be too dark - it's absolutely not too dark in our bedroom. I like cooler colors in the bedroom, but I would think straight gray would be a bit too... sullen.

Previous owner made several terrible color choices throughout this house, but this was not one of them. We will be repainting all the rooms eventually (even in the rooms with good colors, the paint job itself is atrocious), and I dunno, we might actually keep the sage. Was also thinking maybe going a bit bluer.

Pick out your bedding first, then paint color. Sage green is fine for a bedroom though.

Paint color is decided after all the other items have been chosen and I like tochoose wall color after I know what bedding to use.

Our bedding is white. I'd like to add in blue accent pillows, and maybe a dark purple. Cool colors are very calming for me.

and because you said you liked lime!

You all are so fabulous! Maybe I can talk my husband into the sage walls.

I love the lime, but that'll just have to be accents. It actually was my accent color in our old teal bathroom.