A good laugh and a long sleep are the two best cures for anything.Irish Proverb
This tip is from Yoga Nidra which is a type of mediation that is a sleepless sleep. Ironically, Yoga Nidra often induces sleep, so I will share this as a technique to use when you are having trouble falling asleep. I use it myself regularly, and I have taught it to my kids as well. It reminds me of counting sheep, but it is a tad more sophisticated.
Start double counting a slow, steady breath backward as follows:
Inhale 72, Exhale 72
Inhale 71, Exhale 71
Inhale 70, Exhale 70
… … …
Inhale 2, Exhale 2
Inhale 1, Exhale 1
If you make it down to 1, start again at 72. I have not made it through this exercise more than three times without falling asleep. You really have to focus to keep count and prevent your mind from wandering. Good luck!