Because of my sleep challenges with insomnia, I've been studying this problem. In addition to the Sleep Class provided me by Kaiser Permanente, there is a ton of info on the internet which comes up from a Google search.
It appears that present day humans evolved about 200,000 years ago. In those far-back times, when it got dark, daytime activities ended. A way of lighting up the darkness was difficult. Maybe a cooking fire did the trick for a little while? People living in those times likely went to sleep when darkness fell.
So humans evolved into beings that got sleepy during dusk, and went to sleep when it was dark. But then modern times came along. Lamps changed into electric lights. Computers and TVs came along with their bright screens.
But we had not evolved away from our ancestors who got sleepy at dusk and slept when it was dark. The present environment of modern humans interferes with a healthy sleep.
In my Sleep Class, I learned some things that might help me with my insomnia challenge:
1. During the day, stay as much as possible in a well lit room. Or better yet, stay outside in the sunlight.
2. Stick to a time when I go to bed.
3. About an hour before bedtime, begin to turn off the lights. Gradually turn off more and more lights in the room that I am in. By bedtime, only one very small light remains on in my room.
4. My bed should be in a room which is as dark and quiet as possible.
The hardest part of my battle with insomnia is having enough discipline to follow my plan day after day. Being physically active is part of that plan. And I can be physically active for awhile. But then comes the day, when I slip that schedule. From there it is a slippery slope down to no schedule at all.
But with that accident of last week in mind, I believe that I am now more determined than ever to conquer this insomnia thing.