Better than the fridge

I know it seems obvious, but it's more effective than you likely think.

Offering a restless insect food will often cause it to stop moving rapidly. This is quite plain, but many people are unaware that even extremely terrified insects will settle down on a piece of fruit like nothing happened. Once, I offered a small carabid beetle banana after dumping it into a plastic dish. It eagerly started gulping away, despite the fact that it was in broad daylight and carabids are extremely skittish.