It's funny because back in my college days when I smoked with some regularity, you just got what you got. There was no "is this sativa or indica?" no choice, just whatever your friends had, or what was going around campus that week.
But now there are so many strains available, all generally quite fresh and potent. Sativa is generally favored for daytime, for creativity, for keeping anxiety at bay while being active.
Indica generally more soothing and relaxing, sink into the couch, etc., That doesn't appeal to me, but I don't have any issues getting to sleep. If I were in need of something to sleep and reduce pain at night, that would be the way to go.
And as far as those of you who have no wish to partake - totally fine too.