Generally best to wait at least a bit. I thought of waking up at 5 AM for right when the servers opened, and it's Balmung mind you so oof on that population. Decided to play it smart and woke up around 6:30 instead, no problems whatsoever.

Even with the technology we have now it can be hard to manage a metric truck load of people trying to slam in all at the same time, not impossible, but not cheap either. Just take a slightly longer nap and you won't run into the problems. ( Unless it's right as an expansion drops, god help us all the amount of problems then )