Is it still true that the best time for making a reservation is some time in the wee hours of the morning when the computers are being updated or is that a thing of the past?
Cancellations on non-paid tix automatically expire, potentially opening up space, don't know if it's 12:01AM, or later, but that was the thinking at one time
I always heard non-paid tickets were cancelled about 4 am Pacific Time. Getting that recently opened up space would be the reason for the wee hour logon. It is conceivable that the reopened space could change the bucket.
I know from experience that 3 day advanced discounts end at midnight Pacific Time regardless of the time zone the trip is in. I learned this the hard way, losing my NARP discount as I dithered on which train option to take!