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If your podiatrist recommends a night splint for plantar fasciitis, give it a try. Based on my experience, I think it does help reduce the "first thing in the morning" pain. If you find that it rubs your foot (which is what happened to me), try wearing a sock instead of putting the splint over your bare foot.
That said, if you are coping with plantar fasciitis and wearing a night splint, don't stop stretching and icing the foot, and take Advil or an anti-inflammatory of choice to help with your recovery. Use all the tools you have!