Yep, and I got rid of mine, but it requires some discipline.

The trick is to NEVER walk barefoot, especially when you've been off your feet for more than half an hour -- and your shoes must have adequate arch support.

The most crucial time is when you're getting out of bed; you have to put your shoes on before you take your first steps for the morning, because the area has "cooled" down.

It took me a few days to get into the habit, and it's a pain in the @ss puting your shoes on for a two minute trip to the toilet in the middle of the night, but it's worth it.

As far as I know, it's caused by lack of stretching of the Achilles and calves