This article will cover potassium and how it affects sleep, good sources of potassium in foods, potassium deficiency symptoms, potassium supplements and potassium supplements side effects, including overdose. Potassium symbol K for the Neo-Latin term kalium is a vital and necessary mineral for the proper function of organs, fluids and muscles. Because it contributes to muscle function restless leg syndrome (RLS) and muscle spasms are symptoms of low potassium in women. Do you ever wake up during the middle of the night grabbing your calf from a painful charley horse? Do you find it hard to fall to sleep easy at night because of restless leg syndrome (RLS)? Do you have muscle spasms in your legs or arms that disrupt your sleep? An article written by the New England Journal of Medicine in 1998 illustrated how low levels of potassium has various effects on the central nervous system causing conditions like tinnitus, memory loss, anxiety, sleep problems from muscle cramps, irregular heartbeat, afternoon sleepiness and confusion. Read more »