Body pillows are a godsend for resting your ankle up comfortably. I use mine especially when I try and stretch out my leg straight which takes a bit of practice when you've been laying with your leg bent for far too long.
The Plush Body Pillow - Steel Gray will be a great addition to already soft bedding. Quality bedding should include more than sheets and comforters. Add a body pillow for cheap to make a comfy bed. Quality body pillows are found in online bedding stores.