Perhaps it is the material, or lack of dye that makes it so. I just like those with a higher thread count, and typically like the darker sheets. Color makes a difference to the eye, but with the lights out, I do not see why there would be a difference. If it is white and all cotton, perhaps that feels better, so you sleep better than on a non-cotton sheet. No sheeting (no pun intended).

I have always have had colored bed sheets from blue, light green and dark pink. I have recently changed to all white sheets and only the color I have is the comforter which is now a really pale green, even my pillow covers are white. why is this?