Morning light has emerged as a pervasive wellness recommendation, championed by sleep doctors, functional medicine experts, and neuroscientists alike. Andrew Huberman has notably constructed entire protocols around this concept. Unlike many wellness trends that require purchasing new products, this practice simply involves stepping outside early in the day to deliver a signal the body is naturally designed to process.
The widespread focus on morning light is not merely about romanticizing a sunrise routine. Instead, it centers on the physiological regulation of circadian rhythm, cortisol timing, alertness, mood, and sleep. For those seeking direct guidance, Huberman outlines his specific morning light protocol in his newsletter, “Using Light for Health.” In it, he ranks viewing morning sunlight among the top five actions for supporting mental and physical health, as well as performance.
Huberman further elaborates on the science of timed light exposure in the Huberman Lab episode, “Using Light: Sunlight, Blue Light & Red Light to Optimize Health.” This episode examines how light influences sleep, alertness, hormones, mood, and overall circadian timing. His argument extends beyond immediate wakefulness; morning light establishes the timing for the entire day. In his newsletter, he explains that viewing sunlight within the first hours of waking—even through clouds—triggers an increase in early-day cortisol release. He identifies this as the ideal time for raised cortisol. That morning signal serves to prepare the body for sleep later that night and may positively impact immune function, metabolism, and daytime focus.
The critical distinction lies in timing. Cortisol is often unfairly demonized in wellness culture, yet the body is biologically programmed to produce more of it in the morning. Research on the cortisol awakening response describes this normal rise as the mechanism that helps the body transition into daytime alertness. The issue arises when modern life flattens, delays, or pushes this rhythm later. Ideally, the body receives a strong morning cue and gradually shifts to a calmer, lower-light state. Morning light reinforces this rhythm, signaling the brain to be alert now and wind down later, effectively providing a biological timestamp rather than demanding a perfect routine.
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While Huberman is a prominent voice, he is not alone in this recommendation. Michael Breus, PhD, known as The Sleep Doctor, told WebMD that every person should go outside and get at least 15 minutes of direct natural light as soon as possible after waking. His logic is that morning light resets the body clock for better sleep. Similarly, Neha Vyas, MD, of the Cleveland Clinic, notes that sunlight benefits vitamin D levels, sleep, and mood, while reminding readers that sun needs vary and sunscreen remains important. The National Sleep Foundation states that bright natural light aids waking, whereas dim environments aid sleep, noting that the circadian rhythm is particularly sensitive to light one hour after waking and in the hours before bed.
The scientific basis for morning light is grounded in circadian rhythm research. This internal clock coordinates sleep, wakefulness, body temperature, hormones, metabolism, and mood. When light reaches the eye, it signals the brain’s circadian pacemaker to coordinate daily functions. Morning light indicates the day has begun, while evening darkness signals it is time to wind down. A 2025 study on sunlight and sleep regulation found that exposure before 10 a.m. was associated with earlier sleep timing and better quality. Specifically, the study showed that every additional 30 minutes of morning sunlight correlated with a 23-minute earlier midpoint of sleep. The conclusion is that light timing matters: morning light anchors the day, and evening darkness protects the night.
Consistency is more important than perfection for this habit. Huberman recommends getting outside within the first hours after waking. He suggests 5 to 10 minutes on sunny days and 15 to 20 minutes on overcast days, as clouds still transmit sufficient light. Crucially, outdoor light is necessary; windows filter too much of the signal. Contacts and standard glasses are acceptable, but sunglasses and blue blockers reduce the effect. The practice does not require staring at the sun. Instead, one should face the light with relaxed eyes and normal blinking. Integrating this into existing habits, such as drinking coffee outside or walking before checking email, makes it sustainable. For those awake before sunrise, turning on bright indoor lights first is advised. A sunrise alarm like the Hatch Restore can also help by gradually brightening the room to create a softer wake-up cue, though it is not a replacement for sunlight. SHOP HATCH RESTORE HERE
Morning light is most effective when paired with lower light at night. The system that responds to sunlight also reacts to screens and artificial lights, which can reset the body clock and disrupt sleep. Huberman’s guidance advocates for bright light early in the day and much less light in the evening. Lowering evening cortisol involves using dimmer, warmer lights. Swapping harsh overhead lighting for circadian-friendly options, such as BON CHARGE’s blue light blocking light bulbs, can support this transition. These options include blue light blocking bulbs, low blue light bulbs, full spectrum bulbs, lamps, and night lights that help create a softer environment after dark. The objective is to dim the lights and lower screen brightness, avoiding a bedroom environment that resembles a lit airport terminal.
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