Awake at Night, Tired by Day: What the Modern Review of Clock Genes Actually Says, and Where an Ancient Description of Day-Night Rhythm Fits Beside It

Feeling alert at night and foggy in the morning is far from rare. Modern life piles up artificial light, shift work, time-zone travel, and late-night phone use, all of which complicate the simple question of when to be awake and when to sleep. The 2025 review highlights one everyday keyword: aberrant light exposure. Eyes, phone screens, and indoor lamps keep sending the brain a steady message that it is still daytime. When that message drifts away from real day and night, the body's internal timing signal is pulled against the outside environment.

Still, the dysregulation the review describes is not the same thing as any one person's insomnia. Dysregulation is a research-level idea describing molecular patterns that show up across groups of people, while the sentence "I can't sleep tonight" is a personal experience filtered through stress, mood, life events, and physical health. A Lingshu passage from the eleventh juan lists how emotion and overexertion act on the body, and modern research reminds us equally that sleep is never a single variable. Attributing an awake-at-night pattern only to clock genes would leave out as much as reducing insomnia only to stress.

The starting point, then, is to accept that rhythm is a phenomenon of daily life and not only of molecules. The hour you wake, the moment you meet daylight, and what you look at in the last hour before bed are all part of the rhythm this paper is talking about. The review studies rhythm in cells and genes; your day studies it in ordinary choices.

Laying out the review's key findings, four main threads stand out.

The first thread is the foundational one for everything that follows: the transcription-translation feedback loops of core clock genes form a molecular backbone behind the sleep-wake cycle. That sentence is the floor on which the rest of the paper rests.

The second thread is about what happens when that backbone drifts. The review reports that dysregulation of core clock genes can further disturb neurotransmitter systems (melatonin, serotonin, GABA, dopamine), metabolic pathways, neuroinflammation, mitochondrial oxidative stress, and synaptic plasticity. In other words, rhythm is not a stand-alone module; it is in constant conversation with many other systems. That is also why rhythm is often discussed together with long-term risks such as cardiovascular disease, metabolic syndrome, and neurodegeneration.

The third thread places the outside world back into the picture. Aberrant light exposure is described in the abstract as something that worsens chronic circadian misalignment, meaning the gap between internal molecular rhythm and external day and night. This is the most directly practical point for a general reader: even if your genes are switching on the right proteins at the right times, long evenings of strong light can still leave the molecular output out of step with the schedule you want to keep.

The fourth thread concerns therapeutic directions the review flags. The abstract mentions several molecular strategies under study: melatonin receptor agonists to help sleep initiation and phase alignment, synthetic REV-ERBα/β ligands aimed at strengthening circadian amplitude, dopaminergic modulators targeting hyperarousal, and GABAergic drugs meant to restore inhibitory balance. It also notes that Traditional Chinese Medicine formulations show multi-pathway regulatory effects on clock gene expression. This article does not recommend any of these as personal treatments, because the review itself cautions that efficacy varies across insomnia subtypes and that pharmacokinetic and long-term safety questions remain open.

Holding the modern molecular view next to the Lingshu description of wei qi, both knowledge systems describe a body that runs on a back-and-forth rhythm between day and night. The twelfth juan of the Lingshu states, "夫衛氣者，晝日常行於陽，夜行於陰，故陽氣盡則臥，陰氣盡則寤," framing daytime wakefulness and nighttime sleep as a movement of wei qi between the yang and yin sides of the body. A nearby passage adds, "衛氣不得入於陰，常留於陽，留於陽則陽氣滿，陽氣滿則陽蹻盛，不得入於陰則陰氣虛，故目不瞑矣," casting sleeplessness as a state in which wei qi fails to enter yin on schedule. Yet the language frames are clearly different. The Lingshu works with ideas such as wei qi, yin and yang, and the yang qiao channel, while the review works with core clock genes, transcription-translation feedback loops, and phase alignment. The two vocabularies may be pointing at a similar pattern, the rhythm between a person and the day-night cycle, but they ask questions, offer explanations, and suggest responses in almost entirely different ways.

The most honest place to make such a comparison, then, is at the level of rhythm and daily life: both traditions care about when one should sleep and when one should wake, and both treat a misaligned rhythm as something worth adjusting. At the level of why the misalignment happens, the review points to genes, epigenetics, and aberrant light exposure, while the Lingshu points to the movement of wei qi and to the effects of emotion and overexertion, as listed in the eleventh juan passage, "憂思傷心，重寒傷肺，忿怒傷肝，醉以入房，汗出當風傷脾，用力過度，若入房汗出浴，則傷腎." Each has strengths and limits. Drawing a strict equivalence would erase the historical context of each; refusing any conversation at all would waste the shared theme of rhythm. A more useful stance is to consult one another at the level of rhythm and to keep the mechanisms distinct.

Reading the 2025 review carefully, the most important thing to keep in mind is the level of its conclusion. It states that dysfunctional circadian clock genes are pivotal in insomnia pathogenesis via interconnected molecular pathways, which is a statement that holds at the group and molecular level, not a personal diagnosis of any one reader's nights. The review's own forward-looking sentence calls for biomarker-driven, personalized chronotherapies, a tell that the field still lacks a mature toolkit for saying to a specific person, "your insomnia comes from this gene, at this phase offset."

The review also lists several open problems: efficacy varies across insomnia subtypes, and challenges regarding pharmacokinetics and long-term safety remain. Those caveats are exactly why none of the interventions it mentions, including melatonin receptor agonists, REV-ERB ligands, dopaminergic modulators, GABAergic drugs, or Traditional Chinese Medicine formulations, should be treated as a universal personal prescription. This article deliberately refrains from making recommendations about any reader's specific sleep situation, because that would go beyond what the evidence supports.

Finally, rhythm is only part of the insomnia story. Stress, mood, life events, and overall health all interact with it. When sleep trouble persists and affects daily life, discussing it with a qualified clinician, who can weigh the whole picture rather than only the clock, is usually more useful than trying to label the problem with a single concept.

Begin with the question itself. Feeling sluggish during the day yet wide awake at night is a very common experience, and the most useful way to read that signal is not "what is wrong with me" but "is my body's internal clock in step with the environment around me." That is exactly what the term circadian rhythm does. A circadian rhythm is not simply the habit of getting up in the morning and sleeping at night; it refers to the way the body's internal activities rise and fall on roughly a twenty-four-hour cycle. The same timing system touches body temperature, hormone release, metabolic efficiency, attention, and mood, so when it drifts, the feeling spreads beyond the bedroom.

That inner time is not an abstract idea. Modern research gives it a fairly concrete shape. The reason it is called a clock-gene story is that cells do not remember time through a single molecule. They remember it through a group of genes that turn one another on and off, forming a loop. For a general reader, it helps to picture this loop as a spring-driven clock. As the mechanism turns to a certain mark, one set of clock proteins begins to accumulate. Once those proteins reach a threshold, they apply the brake and hand the work to another set of proteins. Those second-stage proteins then slowly nudge the first set back down. When a full cycle finishes, almost twenty-four hours have passed. This is not a metaphor. It is a real molecular metronome running inside the cell nucleus, and the 2025 review titled "Circadian clock genes and insomnia: molecular mechanisms and therapeutic implications" (Europe PMC, 2025-10-22) describes it as a transcription-translation feedback loop, with newer regulatory layers such as SUMOylation refining the picture.

What happens when this molecular clock runs off beat? According to the review, once the rhythm drifts, it can pull other systems with it: neurotransmitter pathways (including melatonin, serotonin, GABA, and dopamine), metabolic balance, neuroinflammation, mitochondrial oxidative stress, and synaptic plasticity are all flagged as downstream territory. Aberrant light exposure is named as one of the environmental factors that makes it harder for the inner clock to stay aligned with the external day and night. The classical text describes a similar drift in a different vocabulary. When wei qi does not return inward on schedule, the daytime-excess state cannot transition into the quieter nighttime mode, and "目不瞑矣" — the eyes cannot close. Both accounts describe a rhythm picture that looks alike, yet they speak in different languages and different units; placing them side by side is meant to make the shared theme of rhythm more visible, not to claim that they are the same mechanism.