I had a problem sleeping when I was going to college. I worked my way through college and worked 54 hours a week(Plus) and kept a full class schedule because at the time Uncle would enlist me to go to war if I were not a full time student. Suffice it to say you would think I'd jump at the chance for whatever sleep I could get. However; it always seemed that I'd lie awake for the first three hours after work and then snooze a bit and wake up, unable to fall back to sleep.
Usually I'd go to school early and find a study hall where I'd end up with my forehead pasted onto a textbook and spend the rest of the day avoiding people who would try to read the mysterious backward message on my forehead.
About this time I also started using coffee and mountain dew as my main beverages of choice; even over water. So it is no surprise that at some point I found myself vibrating in my standard non-vibrating bed and deciding that maybe--too much caffeine. I swore off caffeine for a few years and they(the government)had this neat lottery thing for armed forces induction that placed me at 365 in an order of - thru- 365 and pretty much insured that the only way I'd go to war was when I decided. So sleep became more regular for me.
These days I get five hours a night during the week and seven on the weekends. If I get more than seven I'm doomed the rest of the day to feel as though I didn't get any sleep at all. My wife on the other hand obsesses about the eight hour thing and I've had to try to tactfully ignore her about this.
In comparison I fall to sleep almost before I hit the pillow most nights, while she lies awake sneering at me.
My blood pressure and other vitals are fine while she has to medicate herself by physician directive.
When I read whether it's a book or kindle I'll reach a point where I have to stop, because I want to nod off(not meant as aspersions to those authors).
At one time I did discover that if I read to her she would often nod off quickly.
However presently with my own predilection to nodding off while reading, I run the risk of falling to sleep while reading and waking up with a black eye.