I fired a full-pressure 125-grain Federal JHP at night, defensively, and could see and hear fine the whole time. This was outdoors.
Indoors, in a small room, a 145-grain Silvertip HP, a not-quite full-pressure load, was fired near me, a short distance to the side of my main field of view, but still within my peripheral field of view. I could still seen fine immediately afterward, and though my ears did not like the experience, I could still hear OK. This was an unexpected ND, so there was not flight-or-fight reflex to mitigate anything. The room was not dark, so I am relating this for the hearing aspect.
Keep in mind that premium defensive ammo, as opposed to cheap practice ammo, is loaded with flash-retardant in the powder mixture. Now, a .357 Magnum, at full pressure will certanly be less pleasant at fire at nght than the typical .45 ACP load. If I wanted to optimize for indoor gunfighting, with handguns, I might reach for a .45 rather than a .357 Magnum, all else being equal, but at this stage of my life, training time is not abundant, and I am better-practiced with DA shooting, so I don't keep my 1911 handy for HD.
I use .40 duty pistols, and qual at night, because I work night shift. (.40 is the standard duty cartridge at my PD; we have some latitiude in our choice of duty pistols.) In my opinion, the .40 is about as obnoxious to shoot at night as .357 Mag. The .357 is a bit louder, but flash is about the same.
My issue with loading milder ammo as the first rounds up to bat, is that the first shot I fire is likely to be the most important, and I want it to be the best I have. I may choose something other than .357 Mag weapon, for any number of reasons, but I know what a full-pressure 125-grain JHP will do to an opponent, and unless old age makes me too feeble, I see little reason to carry anything else in a full-sized .357 sixgun that is kept for close-range defense against human predators.