Why Can't You Lay It Down?

Now that I've been writing for over 25 years and have 33 or so novels, plus been a critic for my wife's 55 novels, I've come to some conclusions about the novelist's favorite compliment, "I couldn't put it down." And I've studied lots of wonderful novels to try and figure out why a reader "couldn't put it down."

Haven't you often wondered why one novel was so compelling it kept you up nights?

Here's a chapter ending: I was so tired I could hardly keep my eyes open. Trying to read the novel I've been working on for several weeks, I just couldn't get to a logical stopping point, so I dogearred a page and reached up and switched off the light. Tomorrow is another day.

And here's another: I was so tired I could hardly keep my eyes open. Trying to read the novel I've been working on for several weeks, I just couldn't get to a logical stopping point, so I dogearred a page and reached up and switched off the light. Tomorrow is another day. Just as I was about to doze off, I heard the scraping of a window being shoved open. What the hell?

Now, which chapter ending is going to cause you to continue reading and not reach up and turn the light off.

If this is interesting to you, these writer's tricks that make a writer's work compelling, I'll continue with this. Advise, please?