Humans, by our very nature, are daytime creatures. Our brains and our bodies have been hardwired for this, and not even the fairly recent (in evolutionary terms) innovation of artificial light can change hundreds of thousands of years of development. In response to darkness, our brains produce a chemical known as melatonin, which makes us sleepy, yet these days we are far removed from the agrarian “get up when it’s light out, go to bed when it’s dark” lifestyle of just a few centuries ago.
The most recent FAA FAASTeam Maintenance Safety Tip conveys the FAA’s growing concern about fatigue, in this case technician fatigue. The issue has long been associated with pilots but rarely with technicians.