I have a lot of respect for mainstream sleep science but almost all of it assumes a normal circadian rhythm aligned with daylight hours. For shift workers it's close to useless. Matthew Walker's "Why We Sleep" barely mentions shift work. Most popular sleep advice — consistent bedtimes, morning sunlight, no screens before bed — actively conflicts with the reality of working nights. The research that does exist specifically on shift workers is mostly buried in occupational health journals. A few things worth knowing: — Light exposure timing is more important than sleep duration for shift workers. You can sleep 8 hours and still feel wrecked if your light exposure is wrong. — A 90-minute nap ending at least 2 hours before your shift starts measurably improves alertness during the shift. Not a 20-minute nap. 90 minutes to get through a full sleep cycle. — "Social jet lag" — the term researchers use for flipping your schedule on days off — is associated with worse long-term health outcomes than just staying on your shift schedule through the weekend. Most of us are trying to apply advice that was never designed for our lives. Has anyone else gone deep on the research here? Curious what others have found.

Every article I've read about sleep improvement was written for someone with a 9-5 job. Sunrise alarms, morning routines, melatonin at 10pm — completely useless when you're getting home at 7am.

So I went through actual circadian rhythm research specifically on shift workers. Here's what stood out:

Fixed nights (e.g. 10pm–6am)

Target sleep window: 7am–3pm. Wear sunglasses on your commute home — sounds stupid but bright morning light signals your brain to wake up right as you're trying to wind down. Melatonin only works if you take it 30–60 minutes before your target sleep time, not randomly.

Rotating shifts

Your body never fully adjusts and trying to force it to is actually the problem. The goal is consistency in your light and dark exposure cues, not a perfect sleep schedule.

Early mornings (e.g. 4am–12pm)

You're closer to a normal rhythm than you think. Your main enemy is evening light exposure — anything bright after 7pm will wreck your sleep quality even if you get into bed on time.

The biggest thing nobody talks about: trying to flip your schedule on days off is basically giving yourself jet lag twice a week.

What have you guys figured out that actually works?

Every article I've read about sleep improvement was written for someone with a 9-5 job. Sunrise alarms, morning routines, melatonin at 10pm — completely useless when you're getting home at 7am.

So I went through actual circadian rhythm research specifically on shift workers. Here's what stood out: Fixed nights (e.g. 10pm–6am) Target sleep window: 7am–3pm. Wear sunglasses on your commute home — sounds stupid but bright morning light signals your brain to wake up right as you're trying to wind down. Melatonin only works if you take it 30–60 minutes before your target sleep time, not randomly. Rotating shifts Your body never fully adjusts and trying to force it to is actually the problem. The goal is consistency in your light and dark exposure cues, not a perfect sleep schedule. Early mornings (e.g. 4am–12pm) You're closer to a normal rhythm than you think. Your main enemy is evening light exposure — anything bright after 7pm will wreck your sleep quality even if you get into bed on time. The biggest thing nobody talks about: trying to flip your schedule on days off is basically giving yourself jet lag twice a week. What have you guys figured out that actually works?