I use your mod with extra biter control https://mods.factorio.com/mod/extra_biter_control what provide me tools for control size of night waves, you really should include this mod as recommended to use with your. It simply allow you to change ammount of enemies per spawner and their minmax spawn rate.

This combo nightfall and extra biter control much more UPS friendly and allow you to set exact difficulty what your PC can handle (i use 15 units per spawner and 10 sec spawn time, so game barely lag and slowdown during night ambush, totally playable) Much better perfomance than, for exapmle, Rampant.

However maybe i ask to much, i understand what nocturnal mod simply suspends ANY attack attempt during day, but, is it possible to make exception for Rocket-Silo Construction? https://mods.factorio.com/mod/Rocket-Silo-Construction
It says what each finished building stage can attract nearby enemies, but i guess, if you finish building stage during day - nothing happen. So, is it possible to implement?

P.S. https://imgur.com/a/ZV77czr recommended settings for potato PC, i really wish to have more, but instead i just significantly reinforce existing biters (500health, 6/60% physical, 75% fire res for example). So if your PC can process more enemies, you should do this (or decrease their ammount, if you think what this is to many and unplayable, after reading Discussion topics i assume what some players will find this mod usefull anyway)

Hey there. So this mod has 2 settings - and suspending attacks during the day is off by default, and this is done to minimize interference with other AI mods such as rampant or rocket silo construction. I would recommend using this default mode if you have other biter AI mods such as those.

If you do enable the feature, what will happen is the newly spawned biters will (assuming Nightfall finds them) be put into "pause" mode until night. It... would be kind of tricky to do case by case exceptions. So I think if you do want attacks during daytime, just leave Nightfall on default settings.

This way, you'll get normal biter attacks, attacks from rocket silo construction and other mods, and then Nightfall will also send some biters at you during the night and shouldn't interfere with any other mods. The experimental mode is really just for those that want attacks only at night, yes ...and by necessity that can, by its nature, interfere with other mods.