Overnight Growing?

[AlittleSalt]

Why is it that tomato plants grow so much when the lights are turned off?

I potted these tomatoes up a few days ago. I looked at them many times yesterday and they were all an inch or a little more below the florescent light tubes. I checked them carefully as I was turning off the lights last night.

This morning, I looked at them without turning on the lights and there they are grown up all around the lights. I'll have to move the lights up before I can turn them on.