The moment they introduced a gem that takes away vampire daytime restrictions I should have known they were really only interested in their production restrictions.
They always played fast and loose with the sunlight thing, e.g. having a vampire stand in the shade of a building on a sunny day, or in the shaded part of a room with daylight coming through the windows. I know from personal experience that that doesn't work. In high school, I had a medical procedure that required injecting a dye that made my skin hypersensitive to ultraviolet light -- basically a temporary, induced case of porphyria, a medical condition that's the basis for a lot of vampire mythology. I not only had to stay indoors for a couple of weeks, but the windows had to be covered the whole time, because even reflected or scattered UV light could burn me badly.
Did the two shows always air in the same night? In other words, will episode 5 of Buffy always match up with episode 5 of Angel? I'm afraid any episode list I look at will have spoilers.
For seasons 4-5 of
Buffy and seasons 1-2 of
Angel, yes, they line up perfectly. The Tuesday night lineup was
Buffy at 8 Eastern and
Angel at 9, so it alternates between them. There's one 2-week span in season 5/2 where there was only a new
Buffy episode one week and only a new
Angel episode the next, so it cancels out and they stay in sync.
The pattern breaks after that, since
Buffy moved to UPN, keeping its Tuesday time slot, while
Angel stayed on The WB but moved to Mondays at 9. They still ran mostly in sync, with
Angel going first now, but there were weeks where the pattern was broken -- although the storylines overlapped a lot less, so it didn't matter as much. And
Buffy's final season premiered a couple of weeks before
Angel's fourth, but finished a couple of weeks after it did, even though they both had 22 episodes. So it was stretched out a bit more.
I'd recommend you finish Buffy and then start Angel, otherwise you might get mixed up with the storylines.
I don't agree. When the episodes debuted, they were back to back on the same night, so we saw them in alternating order, but we could still follow their respective storylines -- and the overlaps make the most sense in that order.