Huberman’s morning sunlight advice, checked against the research

What Huberman Lab recommends for morning sunlight

Every Huberman point in this guide is quoted from one of two Huberman Lab newsletters, “Toolkit for Sleep” from 2021 and “Using Light for Health” from 2023, and set next to published studies. Huberman calls “View morning sunlight!” one of his common refrains (Huberman Lab, 2023).

On timing, the 2021 newsletter says to go outside within 30 to 60 minutes of waking (Huberman Lab, 2021). The 2023 newsletter says within the first hours of waking, as soon as you can, even through cloud cover (Huberman Lab, 2023).

On timing, research points the same way. A 2026 public health policy brief recommends time in daylight each day, especially within the first few hours after waking, while following local sun-safety advice (Piper et al., 2026). Light in the morning can shift the body clock earlier (Spitschan et al., 2025).

How many minutes of morning sunlight does Huberman recommend?

The two newsletters give different numbers. In 2021: 10 minutes on bright cloudless days, 20 on cloudy days and 30 to 60 on very overcast days (Huberman Lab, 2021). In 2023: 5 to 10 minutes on a sunny morning and at least 15 to 20 on overcast days (Huberman Lab, 2023).

Research does not set such a number. Current evidence does not support one fixed instruction like “X minutes of bright light per day” for all people, and the same brief calls morning time outdoors a practical example, not a fixed prescription (Piper et al., 2026). People also respond to light differently (Spitschan et al., 2025).

Does Huberman’s morning sunlight work when it is cloudy?

Huberman says that even on overcast days there is still enough sunlight outside, but you need to stay out longer (Huberman Lab, 2023).

The direction fits the measurements. Daylight changes with the weather (Spitschan et al., 2025). In a study in Singapore on cloudy and partly cloudy days, a mannequin head in an open park caught 11,080 to 18,176 lux at eye level, while two indoor rooms measured 112 to 156 lux (Lanca et al., 2019). That is one city and a few rooms, and the study did not test how many minutes are enough.

Does morning sunlight work through a window?

Huberman says it does not: through a windshield or window, too many of the relevant wavelengths are filtered out (Huberman Lab, 2023).

Studies agree that a window seat gives you much less light than outdoors. In 671 everyday scenes, outdoor scenes were about five times brighter than indoor scenes with a window (Tabandeh & Spitschan, 2026). The type of glass does change which light comes through, but ordinary clear glass let about 91% of visible light through in the studies of a 2023 review (Ghaeili Ardabili et al., 2023). So most of the gap comes from being indoors, not from the pane alone. The studies used here did not measure car windshields.

More on what glass lets in: does sunlight through a window count?

Should you wear sunglasses for morning sunlight?

Huberman advises against sunglasses for morning light if you can do without them safely; contact lenses and eyeglasses are fine (Huberman Lab, 2021).

Sunglasses do lower the light at your eyes. In the Singapore measurements, lenses of solar class 3 cut it drastically, although light levels outdoors with sunglasses were still 11 to 43 times higher than indoors (Lanca et al., 2019). Sun protection comes first: from a UV index of 3 the WHO advises protection, including sunglasses, and below 2 it is normally not needed (WHO).

On one point Huberman Lab and LightOtter say the same. Never look directly at the sun, or at any light so bright that it hurts (Huberman Lab, 2021).

How to get morning sunlight in winter or before sunrise

If it is dark when you wake up, Huberman suggests turning on bright indoor lights and going outside as soon as the sun is out (Huberman Lab, 2023).

The research says much the same. An expert panel recommends at least 250 lux of melanopic light at the eye throughout the daytime and suggests using daylight first where it is available (Brown et al., 2022). For winter at high latitudes, the policy brief puts weight on bright rooms and on time outdoors when daylight is there, and on bright enough indoor lighting when it is not (Piper et al., 2026).

Daylight in the dark months: read the winter guide.

Is morning sunlight better than afternoon sunlight?

Huberman recommends both. The 2021 newsletter says to view sunlight again in the late afternoon, before sunset (Huberman Lab, 2021).

Time of day matters for the body clock: light in the morning can shift it earlier, light in the evening can shift it later (Spitschan et al., 2025). The expert panel recommends bright light throughout the daytime, which includes the afternoon (Brown et al., 2022). The studies here do not test a late-afternoon walk as a separate step.

Light in the evening and at night

Huberman advises avoiding bright lights, especially bright overhead lights, between 10 pm and 4 am, and using only as much light as you need to move about safely (Huberman Lab, 2021).

Brown et al. give numbers for this. From at least 3 hours before bedtime, light at the eye should stay at or below 10 lux of melanopic light, and the sleep environment should be as dark as possible (Brown et al., 2022). The direction is the same, but the research ties the limit to your bedtime rather than to the clock.

Does Huberman say to wake up at the same time every day?

Yes. His 2021 sleep newsletter says to wake up at the same time each day and to go to sleep when you first start to feel sleepy (Huberman Lab, 2021).

On the wake-up time, the CDC says the same: it lists going to bed and getting up at the same time every day among good sleep habits (CDC). On bedtime the two differ a little. The CDC names a fixed time, Huberman the first sleepy feeling.

Huberman vs. research at a glance

Each line sets a Huberman Lab recommendation next to what the studies above say.

• When: Huberman says within 30 to 60 minutes of waking (2021) or the first hours (2023). Research says especially within the first few hours after waking (Piper et al., 2026).
• How long: Huberman says 10, 20 or 30 to 60 minutes by weather (2021), or 5 to 10 and 15 to 20 (2023). Research names no fixed number for everyone (Piper et al., 2026).
• Clouds: Huberman says go anyway and stay longer. Measurements on cloudy days found outdoors still far brighter than indoors (Lanca et al., 2019).
• Window: Huberman says it won’t work. Outdoors was about five times brighter than indoor scenes with a window (Tabandeh & Spitschan, 2026).
• Sunglasses: Huberman says skip them if it is safe. They cut light at the eye, but outdoors stayed 11 to 43 times brighter than indoors (Lanca et al., 2019); from UV index 3 the WHO advises protection (WHO).
• Dark mornings: Huberman says bright indoor lights, then outside once the sun is out. Research says daylight first and bright indoor light when daylight is missing (Brown et al., 2022; Piper et al., 2026).
• Evening: Huberman says avoid bright light from 10 pm to 4 am. Research says at most 10 lux of melanopic light from 3 hours before bedtime (Brown et al., 2022).
• Wake-up time: Huberman says the same time each day (2021). The CDC names the same time every day for getting up and going to bed (CDC).

How LightOtter’s rule of thumb differs

LightOtter does not use Huberman’s numbers. The app estimates your minutes from cloud cover and the height of the sun where you are.

Its own rule of thumb is about 10 minutes on a clear morning, 15 when partly cloudy, 20 to 25 when overcast and up to 30 with a low sun. On dark winter mornings it uses about 25 minutes once it is light. It is an estimate, not a measurement, and it does not come from Huberman Lab or from the studies cited here.

How LightOtter estimates your minutes: the method.

What this is not

This guide compares advice about light. It is not medical advice, and LightOtter is not a medical device. Research gives general guidance rather than one dose for everyone (Piper et al., 2026). If you feel tired for a long time, talk to a doctor. LightOtter is not affiliated with Andrew Huberman or Huberman Lab.