You're just reinforcing the culture that it's ok for these things to steal you life from you.
- Outside of a young startup you should be paying someone to monitor/fix your servers overnight as their job.
- It's very very rare that a deal shows up that can't wait until morning and by handling it right away you are telling the client that you'll drop everything to deal with them...which isn't a good or sustainable practice.
- What could you possibly do at 10pm one night when a client declares bankruptcy? Deal with it in the morning.
By not declaring all these situations unworthy of your consideration/time ahead of time you are saying to everyone that it's okay to interrupt you at any time for any reason...fuck whatever else you are doing at the time.
Such a shitty deal.