Insomnia can be caused by an array of different factors.
Generally, in this modern era, people do not realise the impact that technology is having on their entire biology.
While it may have been true 20 years ago that insomnia could be "cured" by a few simple remedies and, was, in many cases, a transient issue brought about by some accute cause, physical or emotional, these days, it is usually a chronic and ongoing issue brought about by the chronic and ongoing use of iPhones, iPads, android and all the other LED screened devices that increase the release of dopamine at inappropriate times as well as cortisol and adrenalin.
It's too much to get into mitochondrial dysfunction. That's years of study to understand.
I speak to lots of people on a daily basis and for the most part, they profess to not using their phone/device ver much.
The only problem is, it's a physical addiction and, like a drug addict, they are lying about their level of use.
One man said he didn't watch his television much or go on his computer a lot.
I lived at his place though.
He spent a minimum of 5 hrs a day between website and tv shows.
Just like all of my diet clients eating in secret and denying how much.
So, barring you have had a traumatic event, or some other obvious reason for short term insomnia,
Try this for a week
Fast completely from all of your devices.
Unplug your router at home.
Greet the sun every morning at sunrise, outside.
Spend an equal amount of time outside as inside. Daily.
E-GO 2018