If I wake up early in the morning, like any time from 2am to 6am, before Alot Hashachar, and I'm pretty sure I'll start my day and not go back to sleep, at least not before a possible afternoon nap, ...
According to the Gemara in Hullin on 107a, if there's a vessel with a hole in it, and there's a "stream" (more than a drip but not necessarily the "sheffoferet hannod" required for a real mikveh) ...
I heard about a minhag the other day (for the first time) and was wondering if there is any makor for it. I was told that people ran out to "catch" the water that was used to wash the Kohanim's hands ...
From what I understand, there are three times when one should wash their hands in the method used for negel vasser that occur every day in the morning (negel vasser) between going to the bathroom ...