What if a team member needs you at 12am?

If there's a need for "core business hours" those can be established. My most recent company was evenly distributed around the globe so needing someone at 2pm PST is not much different than needing someone at 12am PST.

The vast majority of companies I've worked at remote have a strong async culture and are better for it. With some obvious exceptions, if you need a response in 15 minutes there's something wrong with your planning.