Hypothetically, if the threshold is normally -60mV, but now we have too much calcium on board, our threshold is now -50mv. That is a difference of 40mV that the cell has to account for in order to depolarize. In skeletal muscle, this can cause weakness, fatigue, etc. Too little calcium will cause the threshold to become more negative (gets closer to the resting membrane potential).
OK, this is probably going to come with you laughing at me... Once in a while I wake up with the back of my head sweating, and it`s more common when I take a nap during the day.
P.S. The Zzz-less Nap Donât worry if you canât always fall asleep at naptime. As long as you donât stress out over it, the rest and relaxation will still do you good. In fact, a study by British researchers found that just lying down with the intention of napping was enough to cause a drop in blood pressure.