Hubby is up frequently at night and because he can't always see well he would get frustrated trying to find his pillow, the top sheet and telling it from the bottom sheet. I went and bought contrasting colored linens and use a light bottom sheet with a dark top sheet and pillow cases and reverse the colors when I change the bed. He is now able to find the top sheet and his pillow, is much less frustrated and I get to sleep , too. People may think I don't care if I match the sheets but I don't care. If it is easer for him then it is worth it.
Hope this hint helps someone else.