OUT OF SYNC: Why Your Melatonin & Metabolic Timing Are Off — And How to Reset Them

Is Summer Light Keeping Your Body From Resting?

The sun sets at 8:30 now. Your phone is still glowing at 11. Somewhere between the long days and the even longer to-do list, your body has lost track of when night actually starts. You’re tired but wired at bedtime. Wide awake at 3 a.m. Reaching for something sweet you don’t even want. Groggy no matter how many hours you log. 

Have you ever considered that this might not be a discipline problem, but a timing problem?

Melatonin is your body’s nightly signal that it is safe to rest. It’s released on a rhythm set by light, not by the clock on your wall. Cortisol, your wake-up hormone, runs on the opposite shift. When the two stay in sync, energy, mood, digestion, and metabolism move in rhythm with them. When summer’s long light, later nights, and glowing blue light screens blur that signal, your internal rhythm drifts from its natural state, and so does everything tethered to it. 

The Circadian-Cortisol-Melatonin Loop

Your body runs on an internal clock, largely governed by light, that coordinates when you feel alert and hungry, when digestion is strongest, and when your body finally feels ready to rest. Two hormones sit at the center of that clock. Cortisol rises in the morning to wake you up and mobilize energy. Melatonin rises in the evening to signal that it's safe to wind down. In a balanced rhythm, these two move like a seesaw, one falling as the other rises.

Summer disrupts that seesaw in a very specific way. Long daylight hours, warm evenings that invite late activity, and screens that mimic daylight all push the melatonin signal later and later. Meanwhile, the stress of a packed summer schedule keeps cortisol elevated past when it should be tapering off. The two signals end up overlapping rather than trading places, leaving the body trying to both rest and activate simultaneously. It’s like you’re serving up a recipe for tossing and turning!

Western physiology would simply call this a nervous system stuck in sympathetic, “go” mode. However, in Ayurvedic traditions, this kind of dusk-to-night disruption is often understood through Pitta, the fire constitution, running hot and active well past the hour it should be cooling. And in Traditional Chinese Medicine, it echoes a potential Yin deficiency pattern: not enough of the cooling, restorative quality needed to balance the day's activity. All three frameworks describe the same underlying need: a clear enough boundary between day and night for the body to know which it’s in.

Melatonin is one of the body’s most reliable internal timekeepers, quietly synchronizing digestion, repair, and hormone release to the day-night cycle. It’s just that most of us are unintentionally telling it the wrong time. Repair can begin with a handful of small, consistent cues, starting the moment you wake up, which may help your body remember its own schedule.

Morning Sunlight: The Original Cue

Of all the inputs that set your internal clock, morning light is the strongest. Getting outside, or even just near a bright window, early in your day helps anchor your body’s sense that “daytime starts now.” Many circadian health practices recommend prioritizing natural light within the first hour or so of waking, since this is when the cue appears to have the greatest influence on the timing of evening melatonin release. There isn’t a single, universally agreed-upon figure for exactly how many hours later that release follows. Yet what’s consistent is the direction of the relationship: morning light early, melatonin on time.

Without that morning anchor, the body has less information to work with. It still produces melatonin eventually, but later, and often less robustly. Add the evening glow of screens, which can interfere with melatonin release, and the signal gets pushed even later. Fixing this isn’t complicated, but it does require intention, especially in a season that tempts us to stay inside during the brightest hours and outside long after dark.

Metabolic Timing & the Late-Night Loop

Melatonin's reach extends beyond sleep. It also plays a role in digestive rhythm, which is why eating late into the evening—a summer staple between barbecues, patio dinners, and long weekends—can potentially compound the disruption. When your body is trying to digest at the same hour it should be downregulating for rest, both processes suffer. The digestive process runs less efficiently, and the melatonin signal has to compete with the work of breaking down a meal.

This is the essence of metabolic timing: when you eat, move, and wind down matters as much as what you eat. A body whose meals, light exposure, and rest all point in the same direction has a much easier time finding its rhythm than one receiving conflicting signals from every direction.

Now if you feel like your rhythm has lost its anchor, you’re in luck because this rhythm is indeed something you can rebuild. Across herbalism practices, adaptogens and nervines have traditionally been used to help clear the way for your body's natural evening release of melatonin. Below are some of the herbs we reach for to support the transition during summer’s longer stretches of light, and all year long.

The Restorative Herbs We Reach For

Ashwagandha (Withania somnifera) is an adaptogen traditionally valued for its calming, strengthening effects on the nervous and endocrine systems, often reached for to support resilience to stress and a steady transition into rest.

Passionflower (Passiflora incarnata) is traditionally used to promote relaxation and support restful sleep, particularly during periods of daytime stress or winding down for the evening.

Skullcap (Scutellaria lateriflora) is a beloved classic nervine, traditionally used to ease nervous tension and support a calm, settled mind at the end of the day.

Tulsi/Holy Basil (Ocimum sanctum) is revered in Ayurveda as a neuro-supportive adaptogen, traditionally used to support balance during times of occasional stress and to ground an overactive mind.

Kava Kava (Piper methysticum) has been used across Pacific Island cultures for centuries to support relaxation, ease muscular tension, and encourage a deep, restful transition into sleep.

California Poppy (Eschscholzia californica) is a gentle herb traditionally used to support relaxation and soothe mild nervous tension.

Reishi (Ganoderma lucidum) has long been revered in Traditional Chinese Medicine as a Shen tonic, traditionally used to nourish a sense of calm and support the body's overall resilience.

Tart Cherry is not an herb in the traditional sense, but it’s worth noting because it is one of the richest natural food sources of melatonin precursors, making it a simple addition to your evening routine. Try it in this Moon Milk recipe, made with Schisandra Rose and Black Elderberry for a nourishing nighttime treat.