Because you're not hourly. You're not paid to work for 40 hours, you're paid to fulfill certain obligations and be held accountable for them. That means sometim

Because you're not hourly. You're not paid to work for 40 hours, you're paid to fulfill certain obligations and be held accountable for them. That means sometimes you might have to work more than 40 hours, and sometimes you might work less. This is not unique to software, you might have to wake up and fix something in the middle of the night the same way a doctor might have to take a call w/ a patient on a weekend when they're on-call. It's part of the job.