Lately it seems as though I encounter most of the delays between 10:30 and 11:30 PM Pacific time. The most common outcome is that after the first click there's a bit of modem activity but the page doesn't change and I eventually click again. Tonight, for a change, I actually got a browser timeout notice (which resolved to the page I wanted when I clicked "Try again," or whatever that button says).

I've taken to dealing with these late-evening delays by taking a short break or doing something else in another browser tab (or window) till the page I'm waiting for comes up.