Humidity fluctuation at night

[you-da-chick]

I have a Janoel 12 incubator, and it is day 3 for 8 silkie eggs.
In the day I'm able to maintain the humidity between 40%-50%, but when I wake up the next day, it was around 30%-28%, but in the morning I can easily bring it back up to between 40-50%. The temperature is very stable, but can the eggs handle the fluctuation of humidity?

 

[Yorkshire Coop]

They should be fine as long as the average humidity is maintained over the entire incubation period. Check air cells for growth & you can adjust accordingly.
Remember humidity is created by the surface area of water rather than the depth.