There are a few days every year that really show which jobs are vital and which can be left aside for a day. I started my car this morning (-32, -40 with wind chill). On my way to work I drove past a hospital and a care home, both were manned. The dairy farm had its lights on. A cop with his flashers drove past me on the way to some emergency. The macdonalds drive-through was open too. I had to be at work by 0600, but I was relieving someone who had been sitting in another office since 1800. On my computer were the same dozen emails I get every morning, each from someone else who drew the short straw.
There aren't many of us on HN that work weekends let alone Christmas morning, but If you too are sitting in a dark office remember that all across the world are millions of other people working the truly important jobs.