It goes without saying that your sheets need to be soft and your mattress supportive. But you also need to like what you see.
When it comes to pillow cases, sheets, duvet covers and so on, you don’t need to be matchy-matchy. Mixing things up adds depth and interest—if you pick a print for your sheets, for example, use a solid color in the same hue for pillow cases and your comforter. Or, vary patterns. Try pairing the classic look of stripes with another print, like a floral.