I tried the usual things to get back to sleep, such as counting sheep - or, in situations where I really needed the rest, I have taken a Tylenol PM, which works for me, but I certainly don't want to become dependent on them, nor should you.

Lullaby
          and
                       goodnight

Then one day I wondered about the falling-to-sleep process - you know: What happens before one falls asleep? The first thing that occurred to me was how I often I fall asleep while watching TV. My eyes always get heavy then, & it is difficult to keep them open; you know what that is like. That is when I got my idea. I would make my eyelids heavy. Here is how I do that.

ZZZ
   ZZZ
      ZZZ

I lie in bed, my eyes open, & then I lower my eyelids, slowly, slowly, as slowly as possible, until they are closed. I do this three or four times. After the third or fourth time, & I have left my eyes closed, I can actually feel the weight of my eyelids atop my sleepy eyes, & they feel very heavy. Sleep usually follows soon after.

"To sleep, perchance to dream - 
                                ay, there's the rub."
                                                       (Shakespeare)

So that is my insomnia cure. It usually works for me, & I hope it works for you or someone you know. Best of luck & a good night's sleep to you! (WAIVER: I am not a medical doctor, nor do I play one on TV.) More insomnia busters