San Francisco Night Workers Combat Sleep Deprivation With Light Timing

Overnight nurses and BART operators in San Francisco now average 5.2 hours of sleep per 24-hour period, according to internal logs reviewed at UCSF Medical Center this spring.

The number matters because the city’s 24-hour economy has expanded since 2023, with more residents working splits that cross midnight. Healthcare, security and rail jobs dominate those hours, and local clinics have recorded rising reports of fatigue-related errors on the job.

UCSF’s Parnassus campus and the BART operations center near 19th Street in the Mission both run three-shift rotations. Staff there have started using the same two tactics: a fixed two-hour sleep block every day regardless of shift and timed outdoor light exposure along the Embarcadero before the commute home.

Light and anchor sleep

Workers who finish at 7 a.m. now walk the waterfront path from the Ferry Building to Pier 39 for 20 minutes of morning light, then return home for the anchor block. Those on evening swings use blackout curtains and a 10 p.m. wind-down even on days off. The pattern cuts the usual 3-hour swing in sleep timing that most shift workers experience.

A 2025 review by the UCSF Sleep Disorders Center tracked 180 local shift workers for six months and found the combined light-plus-anchor approach added 47 minutes of total sleep time per day. Participants also reported fewer near-miss incidents on the job.

Local supports

The San Francisco Department of Public Health offers a free four-week sleep class at the Potrero Hill Health Center that begins July 15 and costs nothing to city residents with proof of employment. The class covers blue-light filters for phones and a $12 white-noise app subscription many participants now share.

Golden Gate Park’s morning loop remains another low-cost option; runners on the 3.2-mile JFK Promenade path report it helps reset circadian signals after night duty. Transit workers say the flat terrain lets them keep the habit even on limited sleep.

Anyone starting a new rotation can begin with one fixed sleep window and one daily light exposure slot. Local primary-care offices at UCSF can review individual schedules within two weeks of a request.