For those who delve into the spiritual side of it all, some info that i simply googled:
::Under a normal 24-hour sleep cycle, awake during the day, this time is about the time when our systems are at their least active. Released from having to do work, or digest food, or all the other distractions of the daytime, our brains can get to work sorting out whatever is troubling us.
::As in a state of trance, this is therefore the time when we are most amenable to spiritual influences. Sometimes our greatest flashes of insight happen at this time, and it is a race to get to a pen before they are so rapidly forgotten.
::it is probably circular time, not linear. Our time zones are not relevant. The veil doesn’t thin across the board for everywhere at once. It thins in places at certain times. During 3 and 4am, our awareness of the other side is much more pronounced, astral travel and lucid dreaming is at it’s peak and spiritual activity in the physical world is more prominent.