Two of the largest ligaments of the wrist are the medial (ulnar) and lateral (radial) collateral ligaments. The MCL passes from the distal end of the ulnar and crosses the wrist to attach to the triquetrum and the pisiform. The LCL passes from the end of the radius, across the joint to the scaphoid.
One of these can be dehydration. Most people in Britain don't drink as much fluid as they need for optimum health. Although, over time, they may inadvertently train themselves not to feel thirsty, the suppressed desire to drink can result in restlessness and a host of minor problems that make sleep difficulties worse.
Here are some signs of dehydration to watch out for: 1  Sleepiness. 2  Irritability. 3  Thirst. Less elasticity in the skin.  Eyes and fontanel (or soft spot on head) appear 1  sunken. Decrease or absence of tears.  Dry 1  mouth. Decrease number of wet diapers.