What do you do when you cannot fall asleep :P ?

Read

Lie there and curse the darkness.  (Not)

I listen to my old-time radio show tapes and cd's.  That way I can leave the light off and keep my eyes closed .... And maybe drift off.

I write

Warm milk and I read paper books. No electronic reading , I find that too simulating.

I go on a run. Get some fresh air, or do that homework you have to do. Try and keep of screens though.

Meditate

If it's a weekday where I have things to do the next day. I take a couple extra melatonin and lay quietly and eventually my thoughts carry me off to dream land. If it's the weekend I watch tv or drink a few beers, or just forget trying to go to sleep altogether and get a early start on the next day!

Take matters into my own hands. ;)

Hello Daniel! With the emergence of next-gen mobile devices, many have developed new habits, and among these are the use of social networks and playing games. I do both when I can’t sleep, but my favourite pastime is a platformer! When I cannot play anymore, I will then spend some time on Facebook or Twitter. I read random articles, comments and other bits; I will start feeling tired within an hour or so. Do note that it is very important to sleep for a minimum of eight hours a day. Here are some tips to overcome insomnia: https://www.psychologytoday.com/blog/the-new-you/201310/three-tips-better-sleep-overcome-your-insomnia/. Hope this helps and all the best!

Drink warm milk, find something on tv that that has little noise and i can just listen to and not have to watch. Usually something educational like the history channel. I set the sleep timer and then lay there with my eyes closed while listening.