The Mining Hat Night Vision enchantment time is very low, causing the sky to blink at night. You could increase the enchantment time and add something to the code that removes the enchantment when you stop holding the pickaxe.

Yeah, that is an issue! :) Thanks for it!

My nephew has an epilepsy problem and this can be a trigger.

Fixed for all versions. The fix is included in the next update. ;)

released in 1.7.0