Runner's high?

Well, today it was a good running day in Las Vegas. Keep in mind that it is July 12th, so that would normally be impossible. Summer running in Las Vegas usually is either done on a treadmill or at 5:30 in the morning. Both of which I hate so I have been a huge slacker since it started getting hot. Also, I have not run more than six miles since we moved here. Today was a different story and I'm having a hard time figuring out why. About midnight last night we had a storm roll through, no rain but lots of lightning and thunder. I woke up at about six to take the dog out and was pleasantly surprised that it wasn't as hot as it has been, due to the cloud cover. I was still tired so I went back to bed. I got up again at 7:30 thinking I really should go run and take advantage of the cloud cover. So, I did, thinking that I would do my normal three mile route that I usually have to drag myself through. I started out dealing with major side stitches and it took me a good mile of walk/running to work through it, I figured I'd be lucky to finish two miles today. I got to the 1.5 mile mark and felt remarkably well so, I altered my course thinking I would run 4-5 miles instead. I ended up getting slightly turned around due to the crazy layout of the streets here. However, I wasn't upset. Ask Phil how my mental condition deteriorates when I realize I have to run farther than I planned. I actually felt awesome! I ended up running seven miles of hills today. I am so happy to know that I still have some gumption left in me. Today is one of those days that I desperately needed to get myself motivated once again. Call it runner's high? Whatever it is, I'll take it!