Hi Pam! You bought up a good point, thank you very much. Drinking a lot of fluids which contains a lot of electrolytes does help in many situations such as tiredness as you mentioned. Especially during hot summer months we tend to sweat a lot and loose a lot of sodium while we sweat. Having the correct balance between sodium and potassium plays an very important role of action potential in contraction of our muscles. Drinking fluids with high electrolytes such as coconut water or Gatorade will put the necessary electrolytes back into your system and prevent muscle cramps and many other things