How Do Cockroaches Respond to Light

Contrary to popular belief, cockroaches are not afraid of light. … Most of these nocturnal insects will scatter when a light is shone upon them. However, this reaction is much more influenced by their fear of humans than their distaste for light.

Will keeping lights on keep roaches away?

Cockroaches are nocturnal and seek to avoid light. However, that’s not because light harms them. It’s because cockroaches understand that they can’t hide or evade predators in open sight. Leaving a night light or lamp on throughout the night won’t drive them away.

Why do roaches run when the lights come on?

Because, they’ve learned. They know that a light being flicked on means that a human has discovered them. And that discovery tends to lead to negative consequences. So, when you turn on a light, cockroaches are not hurling themselves into gaps and other hiding places to get away from the light.