Not even Irish wrote:
Magnesium deficiency,
Buy magnesium oil and Epsom salts and put in a hot bath. Do it once a week.
The only way to significantly increase magnesium levels is through the skin.
Being a runner your probably at the lower end for this vital mineral, Magnesium. Magnesium Oil and Epsom Salts have been used as the transdermal method to avoid the laxative effect which is effective but just as effective and less time consuming is taking oral Magnesium. Instead of getting the laxative form, Citrate, Oxide spend a little more and get the Malate or Glycinate form take 300mg with your dinner you'll feel more relaxed and set yourself up with the best chance to fall asleep naturally.
I had a stress reaction earlier this year so I continued with Magnesium Malate but increased Calcium taking calcium citrate(no affect on bowels) and the natural sleep aid effect still worked. Another bonus was the recovery and energy for running.