Light is the single strongest signal your body uses to set its internal clock — and for most shift workers, it’s exactly backwards: bright light when you should be winding down, darkness when you need to be alert.
Why it matters for shift workers
Morning daylight tells your body it’s time to be awake and sets a timer for melatonin release roughly 16 hours later. When your ‘morning’ is actually 7pm, or you’re heading home into bright daylight after a night shift, those signals get scrambled — and a scrambled body clock is behind much of the fatigue, poor sleep and low mood shift workers report.
Getting light exposure right is one of the lowest-cost, highest-impact changes available to shift workers — and one of the most commonly ignored.
Light protocols for irregular hours
Seek out bright light — daylight if you can get it, a bright light source if you can’t — early in your working period, whatever time that falls. This is the equivalent of morning sunlight for a day worker, and it’s the single strongest tool for anchoring your body clock to your actual schedule.
Just as important is avoiding light at the wrong time: wear dark, wraparound sunglasses on the drive home from a night shift to blunt the daylight signal, and keep your bedroom properly dark with blackout curtains or an eye mask once you’re there. Dim the lights and avoid screens in the hour before your sleep window, even if that’s the middle of the afternoon.
What Huberman recommends
Light exposure protocols are one of the cornerstones of Protocols, and Huberman sets out exactly how and when to use light to set and shift your circadian rhythm — guidance that adapts directly to rotating and night shift patterns, not just a standard 9-to-5.
As an Amazon Associate, I earn from qualifying purchases. See our Affiliate Disclosure for details.