I'm suffering from PF in my right foot myself. From research and trying various remedies, I've found these items to make a difference:
1) if your bed covers/comforter is tucked in at your feet then untuck it. This pulls your feet forward and down due to the weight.
2) if you wear shoes that the toe portion is rolled up, like running shoes. Throw them away and get a flat shoe with minimal heal and flat toe area.
3) One leg, unweighted calf raises off a 3 inch block helps.
4) add in arch supports to your shoes. Flat foot can contribute to PF.