I woke up this morning with a sprained ankle. It was fine when I went to bed. What could it be?
You may have thrashed around in your sleep and pulled a tendon in your ankle. You should treat your sprained ankle correctly in order to aid healing.http://forums.wrongdiagnosis.com/showthread.php?t=31323http://drbenkim.com/articles-sprainedankle.html
Do you have a history of sleep walking? Did you take any meds (prescription or OTC) before bed, which might have suppressed memory of getting up during the night?