IMHO i think that actually going in and removing any leftover crickets would only do more harm than good. The chance of a cricket biting your cham while they sleep and doing any harm is much lower than the amount of unnecessary stress you will cause by digging around in their enclosure every single day to pick out leftover crickets. If there's tons of them all over the place then yeah maybe, but I wouldn't stress out about 4-5 crickets being left overnight, your cham will be fine.