[neilv]

> Those 2 months were hard, [...] but also with the SO complaining that I wasn’t available to reply to messages sometimes (because I was sleeping when she was awake), which was no encouragement to keep going.

I hope it's not too personal to ask, but I'm wondering how that is working out with the SO.

My own experience thus far, as someone whose body by default seems to want to do 25-26 hour days (and can do much longer when I choose), is that an SO is one reason to force myself to stay on a 24-hour cycle.

If you're both doing grad school, hospital shifts, startups, trying to make partner, traveling a lot for work, etc., then having your schedules not always overlap might come with the territory, and you both can adapt. But if they find they're often wanting to spend meaningful time with you after their work, and you're sleeping during normal-person waking hours, they might be wondering whether this is the right long-term relationship.