If I’m having a serious attack of emo in the armpit of the night, I’m more likely to bother friends/family in different time zones than bother anyone who may be sleeping. My mother and some of my oldest friends are all at least seven hours away from me, so my deep dark night could be their morning or afternoon.
That said, there are a few people in my time zone I know who would listen to me (and who I’d listen to) pretty much anytime, but we all keep odd hours anyway.