Dude...you should never, ever have loose crick's in with your leo. Sleeping leos aren't smart enough to chase away nasty crickets that will gnaw on/eat their toes, etc. Crickets it each other, they eat gecko poo, they eat cardboard. And they will eat your leo too.
When you feed, you should only leave prey in for up to 15 minutes or so. After that, you MUST remove all the loose bugz.
I've had crickets try and eat each other alive...what's to stop them from chewing on your leo's eyeball? (sorry, I just detest crickets!! My colonies get everything except cricks!!)
Instead of stressing and annoying your little guy with crickets, try giving him variety -- mealworms, waxworms, supers, butters, roaches...etc. They love getting something new every night and its much healthier!
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Too many Leos
1.0 feline "Spot"
0.1 canine "Tika"