I've experienced this one time and it was quite a long time ago and ended up being my fastest mile time ever.
I was running the mile for the 7th grade track team and I had never gotten under 6:00 and never gotten better than fifth place. So I'm running doing my usual strategy of catching up most people after the first 3 laps but I was like, "you know what. If I just sprint the last 300 meters then maybe I can get third." So I did. I started sprinting and passed like 5 people and they were all like, "wtf wtf wtf" and started sprinting as well but I had already surprised them enough to where it wouldn't matter. I finished the race in third with a time of 5:53 and I experienced that "runner's high."
I strangely experience a 'high' feeling after enough exhaustion and physical exertion. Your body beyond that only feels better from continued exercise, so you don't feel like taking a break. Afterward, your feel mad tried, though.
For me to get it I just have to "get over the hump".
It always seems miserable from when you first start to that point...sometimes you want to quit very soon, but as soon as a will myself past that invisible threshold it gets a lot easier. Maybe it's because our bodies start really mobilizing carbs to us or something, I dunno.
I personally listen to audiobooks while running. I get so focused into the books, the next thing I know I almost need to catch a cab home.
yeah, after 30 mins or so you should be ok. The first 30 mins are the hardest (at least for me).
Ive hit runners high twice in my life. First was during a night run that I put in about 11-13 miles (made a thread about it even) and the second was during just a simple 5k race that I kicked with about 3/4 of the last mile to go. Best feeling in the world.
Is it like drugs? Yes. Its the reason why I consider running fun or a hobby instead of work. Small second winds are awsome, but the real thing is legit (even if you dont realize thats what it is until its over).