Plantar fasciitis is a condition that results in pain because the plantar fascia, a thick band of tissue that runs across the bottom of your foot, has become irritated and inflamed.
One thing that helps relieve the pain of plantar fasciitis is stretching and gentle movement. When you’re sleeping at night, your foot is in a relaxed position and doesn’t pull or stretch on the heel. So, when you wake up, the area is tight and painful. It’s said that the most painful time for plantar fasciitis is your first steps out of bed, or if you’ve begun to walk after a long period of inactivity.