If you’re uncomfortable with deviation from your schedule, you’ll be uncomfortable with the natural variations that happen in life that aren’t in your control.
Remind yourself not to desire what is out of your control.
Yes, maybe you’re thinking you can manage your schedule. You’re not wrong. However, there’s no reason to let the rest of your day be disturbed when you don’t go to sleep or wake up at the same time. What are you called to do, no matter what time you wake up? Your job is to do good work—that goal transcends all schedules.