I am a 44 year old male with AMN. I have used a wheelchair for 11 years, though I have some ability to stand. Sometimes when I wake up in the morning my legs are completely taut and hard to straighten again. I presume that they have been this way all night. When this happens, my legs are very weak and not able to bear much weight. I presume it is because they have been busy all night staying so taut and have not had any chance to rest. Has anyone else experience this or know of the explanation or ways to prevent?