If you are in the US, keep in mind that those countries are in distant timezones. Because 4chan threads are so ephemeral, they could have entire threads to themselves while you are asleep and you wouldn't notice.
I'm in India at the moment, but I have lived in other timezones too. I must add that I'm not a regular there. I only go there when some promiment thread makes the nwes... like Tay, or Operation Google, or this. Other than that, my source for 4chan stuff is /r/4chan.