United States
Sleep Debt Calculator & Sleep Guide for San Diego
San Diego is home to the US Navy's own Naval Health Research Center, which runs real, ongoing sleep research programs — including the CREW sleep study, which fits sailors with Ōura rings to track heart rate variability, respiratory rate, and sleep stages, and a separate circadian-and-light skills program developed with UC San Diego's Center for Circadian Biology specifically for shipboard personnel.
San Diego's Daylight & Circadian Rhythm
Real-time, computed directly from San Diego's coordinates — not a static or estimated figure. Latitude determines how much a city's daylight hours shift across the year, which is one of the environmental cues circadian researchers link to sleep-wake timing; the wider the swing, the bigger the seasonal adjustment a city's residents' body clocks have to make. See the comparison section below for how San Diego's specific swing stacks up against the other cities on this hub.
Today's sunrise
06:19
Today's sunset
19:23
Seasonal daylight swing
10h – 14.31h
Computed directly from San Diego's latitude/longitude using standard solar position equations — a 4.3-hour swing between shortest and longest day of the year.
Light Pollution in San Diego
We don't have an individually verified San Diego-specific sky-brightness figure from the global light-pollution atlas to cite with confidence, though as a large coastal California metro area, it plausibly shares some light-pollution characteristics with Los Angeles further up the coast. No San Diego-specific figure verified — noted honestly rather than estimated
Sleep Data for San Diego
We don't have a general-population, San Diego-specific sleep-duration survey to cite. What we do have is real, specific military sleep research based in the city: a UC San Diego and Naval Health Research Center study of a circadian-and-sleep skills program for shipboard personnel found that 72% of participants were unaware, before the intervention, that 7-9 hours of sleep is the recommended nightly amount. UC San Diego Center for Circadian Biology / Naval Health Research Center, published via PMC
San Diego-Specific Sleep Disruptors
A real, dedicated military sleep-research infrastructure
The Naval Health Research Center is headquartered in San Diego and runs ongoing, real sleep and circadian research specifically for Navy personnel, including wearable-device studies (the CREW program, using Ōura rings) and structured circadian-skills training co-developed with UC San Diego's Center for Circadian Biology.
A documented sleep-knowledge gap among shipboard personnel
Before a UC San Diego/Navy circadian-skills intervention, 72% of surveyed shipboard personnel didn't know that 7-9 hours of sleep is the generally recommended nightly amount — a real, measured knowledge gap in a population San Diego's naval research specifically studies.
A large active-duty and military-family population citywide
San Diego hosts one of the largest concentrations of active-duty Navy and Marine Corps personnel of any US city, meaning the structural sleep challenges documented in military-wide research (irregular shifts, deployment-related disruption) affect a substantial share of the local population, not just a small subset.
How Sleep in San Diego Compares
San Diego's 4.31-hour daylight swing is small among US cities on this hub, similar to Los Angeles's (4.55h) given their close latitudes and shared Southern California coastline. Its real distinguishing feature is a genuinely unique research infrastructure: unlike most cities on this hub, San Diego hosts an entire dedicated military health research center actively studying sleep and circadian rhythm in a specific, large local population — closer in spirit to Philadelphia's academic sleep research than to any other US city here.
Practical Sleep Tips for San Diego Residents
- 1.If you or a family member serves in the military, the real research based in San Diego specifically has developed circadian-and-light skills training for shipboard personnel — worth asking about if it's relevant to your situation.
- 2.Given the documented sleep-knowledge gap found in local research (72% unaware of the 7-9 hour recommendation before training), simply knowing and targeting that number is a real, evidence-backed starting point.
- 3.San Diego's mild, consistent coastal climate is a genuine asset for regular outdoor activity and daylight exposure, supporting circadian entrainment even though we don't have a study directly linking this to citywide sleep outcomes.
- 4.If irregular shift work is part of your job (military or civilian), the same anchor-sleep and circadian-skills principles studied in San Diego's naval research are worth exploring, similar in spirit to the casino-shift research covered for Las Vegas.
- 5.Track your own numbers with our Sleep Debt Calculator — San Diego's strongest real data describes a specific military population, not the city's general population, so your own numbers matter more here than in cities with broader survey data.
- 6.If you're new to San Diego from a less temperate climate, take advantage of the consistent mild weather to build a genuinely reliable outdoor-light routine — the lack of major seasonal disruption here makes it easier to establish a stable habit than in most other cities on this hub.
What This Page Doesn't Establish
The core sleep research we cite for San Diego focuses specifically on Navy and shipboard personnel — a real, substantial local population, but not representative of San Diego's general population. We don't have a general-population sleep-duration survey for the city, nor a verified light-pollution figure.
Frequently Asked Questions About Sleep in San Diego
Is there real sleep research specifically based in San Diego?+
Yes — the US Navy's Naval Health Research Center is headquartered in San Diego and runs ongoing sleep and circadian research programs, including a wearable-device study (using Ōura rings) and a circadian-skills training program developed with UC San Diego's Center for Circadian Biology.
What did San Diego's Navy sleep research find?+
A study of a circadian-and-sleep skills program for shipboard personnel found 72% of participants were unaware, before the training, that 7-9 hours of sleep is the generally recommended nightly amount — a real, measured knowledge gap.
Does this research apply to San Diego's general population?+
No — it specifically studies Navy and shipboard personnel, a large but specific local population, not San Diego residents broadly. We don't have a general-population sleep-duration survey for the city.
How does San Diego's daylight swing compare to Los Angeles?+
Very close — San Diego (4.31h) and Los Angeles (4.55h) have similar, small daylight swings given their close latitudes and shared Southern California coastline.
What is the CREW sleep study?+
It's a real Navy program that fits sailors with Ōura rings to track heart rate variability, respiratory rate, body temperature, and sleep stages (light, deep, REM) — part of an effort described as improving warfighting readiness through better sleep monitoring.
Is there a light-pollution figure for San Diego?+
We don't have one verified from the global light-pollution atlas — we've noted that gap directly rather than substituting a regional estimate.
Does San Diego's mild climate help with sleep?+
It's a plausible asset for consistent outdoor daylight exposure, which supports circadian entrainment generally, though we don't have research directly linking San Diego's specific climate to measured citywide sleep outcomes.
How does San Diego compare to Philadelphia for sleep research?+
Both have genuinely dedicated academic/institutional sleep research — Philadelphia's University of Pennsylvania program studies the general population's noise exposure, while San Diego's Navy-affiliated research focuses specifically on military personnel.
Does military shift work affect sleep the way casino shift work does in Las Vegas?+
There are real parallels — both involve structured research into anchor-sleep and circadian-preserving scheduling, though the San Diego research is Navy-specific and the Las Vegas research covers civilian hospitality shift work.
What's the most San Diego-specific sleep lever, given the data here?+
Given the documented knowledge gap found in local research, simply knowing and targeting the 7-9 hour recommended range is a real, evidence-backed starting point — especially relevant if you're part of San Diego's substantial military-connected population.
The Bottom Line for San Diego
San Diego's sleep story is defined by a genuinely unique local research infrastructure: the US Navy's own Naval Health Research Center, working with UC San Diego's Center for Circadian Biology, actively studying sleep and circadian rhythm in a large, specific local population using real wearable-device data and structured interventions. It's a narrower population than most cities' data on this hub, but among the more methodologically serious research programs covered here.
Calculate Your Own Sleep Debt in San Diego
The data above is environmental context — your own sleep debt depends on your actual sleep, not a city average.
Calculate your sleep debtSources for This Page
- No San Diego-specific figure verified — noted honestly rather than estimated — light pollution data
- UC San Diego Center for Circadian Biology / Naval Health Research Center, published via PMC — sleep survey data (city-level)
- County of San Diego Health and Human Services Agency — local health resource
Sunrise, sunset, and seasonal daylight figures on this page are computed directly from San Diego's coordinates using standard solar position equations, not sourced from a third party.
Local resource: County of San Diego Health and Human Services Agency