In reading just now excerts from "Stalingrad: The Fateful Siege: 1942-1943 By Antony Beevor", Its talks of how Chuikov had ordered an emphasis on night raids because the Luftwaffe could not respond and that he was convinced it struck fear into the Germans. It talks about the use of flares to constantly trick soldiers into a belief of an imminent attack.

In addition a comment from a corporal about the "eerie change in sound" of the U-2 bi-planes used for night time bombing as the pilot would turn off the engine on assault until the bomb hit.

So a constant psychological onslaught from the Russians, the author comments as well that the Germans were exhausting ammo as they would fire at anything during the night.

edit: type in: "Stalingrad night raid" the piece i read should be in Google books.

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Since I would imagine fighting never stopped and only slowed , I would like to ask an additional question. Did either the Russians or German troops have any tools to aid in thier night vision? I always hear about the Japanese Navy having great night optics but did generals or armies have access to night optics?