What effects do fluctuating humidity have?

[ChasWG]

So I recently got my mini-greenhouse up and running and after messing with it for a day or so I have had to set my humidifier on a clock timer. If I just let it run non-stop the entire enclosure gts totally soaked and the humidity can reach up to 90+%. So I set the timer to go on and off every 15 minutes. So for 15 minutes the humidity is down toward 25% then jumps up to 80% or so. I've recorded a high of 88.2% and a low of 23.6% over night. Now I did have the timer set to have longer gaps of not running at night. Up to 45 minutes being off.
My assumsion is that in a jungle environment the humidity drops at night.

Am I wrong? Will the constant fluctuation cause problems? Is the sky going to fall? Will the other kids laugh at me?

These are just some of the questions I have running wild in my head.

Thanks!