It was fine last night when I went to bed. Can't think of anything I did to it yesterday that might have developed during the night. But when I got out of bed this morning it was very sore and stiff. It hasn't really got any better during the day and is also quite tender to touch on the outside lower edge of the knee.
Anyone else experienced this? I can't have injured myself in my sleep, can I? That would just be weird!
I do have a history of sore knees, mainly connected with the weather, but I've never gone from nothing to this overnight before.