Low Mood Might Be a Light Problem

Have you felt flatter than usual lately? Not catastrophically low. Not crisis-level. Just… grey. Heavy. Slightly compressed in spirit. After what felt like an endless carpet of cloud this winter, that feeling makes biological sense. Low Mood Might Be a Light Problem Before we pathologise your mood, let’s ask a simpler question: have you been getting enough of the right light at the right time of day? In the darker months, especially when mornings are slow to brighten and evenings close in early, most people are operating in a dim environment for far too long. Add in rain-heavy skies and long workdays indoors, and your eyes - and therefore your brain - are not receiving the light input they rely on. Light is not just visual. It is neurological instruction. When bright light hits your eyes in the morning, signals travel to a small but powerful structure deep in the brain called the suprachiasmatic nucleus - your body’s master clock. This clock influences the pineal gland, which helps regulate two crucial chemicals: serotonin and melatonin. Serotonin is often referred to as a “feel-good” neurotransmitter. It supports mood stability, focus and a sense of wellbeing. Morning light exposure helps initiate its daytime activity. If you wake up and move straight into artificial indoor lighting - or worse, a dim environment - you blunt that signal. No clear “day has begun” message. No strong neurochemical shift into alertness and positivity. And if that pattern repeats for weeks, you can end up in a low-grade fog - not fully depressed, but not fully energised either. Why Morning Light Is Non-Negotiable The most effective way to trigger that serotonin activation is simple: get daylight into your eyes as soon as possible after waking. That means: Step outside within 30–60 minutes of waking, even if it is cloudy. Look towards the horizon (not directly at the sun). Spend at least 5–10 minutes outside - longer if the sky is overcast. Even on a grey day, outdoor light intensity is significantly higher than indoor lighting. Your brain can tell the difference. Overhead lights on in the morning can help. Brighter, cooler (slightly blue-leaning) white light supports alertness. But screens are not a substitute for daylight. In fact, relying on your phone in a dim room first thing is one of the least effective ways to start your circadian rhythm. When clients come to me with low mood or sleep disruption, this is one of the first practical interventions we address. Not because it solves everything - but because it stabilises the biological foundation. You cannot out-think a dysregulated circadian rhythm. And you cannot mindset your way through a chemistry problem caused by light deprivation. Evening Light Is Just As Important Here’s where it gets interesting. The same pineal gland that participates in daytime serotonin regulation becomes your melatonin machine at night. Melatonin is the hormone that signals your body to sleep. But it is light-sensitive. To trigger melatonin production effectively, your brain needs the illusion of sunset. What happens at sunset? The sun drops from overhead to the horizon. The light softens. It warms. It dims. Yet in many homes, early evening looks like this: Bright overhead lights blazing. LED panels flooding the room. Screens held directly in front of the eyes. We are effectively telling the brain it is midday at 9pm. If you want better sleep - and by extension better mood - begin shifting your lighting as early evening approaches: Switch off overhead lights. Use lamps around the room instead. Choose warm white or slightly amber/red-toned bulbs. Reduce screen exposure, especially close to bedtime. You are manufacturing sunset. And when you do, melatonin can rise properly. Sleep deepens. The boundary between day and night becomes clearer. Why This Winter Felt So Draining This past season felt particularly oppressive for many - heavy cloud cover, short days, relentless grey. If you missed out on strong morning light exposure for months, your serotonin rhythm may have been under-stimulated. Without clear daylight signals and equally clear evening wind-down cues, your brain drifts into a blurred state. Not fully awake. Not fully restored. Just vaguely depleted. The good news? We are moving into brighter months. Longer days mean more opportunity to reset. Use it. Get outside early. Let natural light hit your eyes. Differentiate your evenings intentionally. Rebuild the chemical contrast between alertness and rest. Before assuming something is “wrong” with you, check your lighting environment. Sometimes low mood is not a personality flaw or a character weakness. Sometimes it is simply a biological system waiting for sunrise. by Gemma Bailey (with the help of Ai) https://www.peoplebuilding.co.uk/franchise