When I try to wait till day or wait till night at my sleeping bag, it will occasionally say "Collect [enter random number here] Survivor Points"... Why does it do this? I have only seen it a few times, but when I do see it, it's a really crazy number (like in the hundred-thousand to ten-millions range). I have already done plenty of research on this topic, but as far as i can tell, nobody else has seen this.
As Chris mentioned, you do earn points passively for being outside at night. You also earn them for doing various things. If you kill enemies of any kind, parkour/agility maneuvers, or escaping volatiles etc. When you choose to sleep until day at the sleeping bag you are both ending the night, and securing your survivor points.
They are called survivor points because you are surviving, if you chose to stay out, you can earn more, but you are risking your life more, hence when you die you lose a large sum of survivor points.
It only says collect points if you have points to collect. This is only a night time mechanic and you shouldn't be seeing it when you sleep until night. It's because you earn 2x more points at night so you lose them if you don't secure them (again by sleeping or just surviving the night).
As for seeing 100,000-1,000,000 points... I have no idea and that's definitely a unique thing. I've racked up a lot of points before by running around killing volatiles but I don't ever recall hitting a million. But I guess it's a possible number to reach.