Dublin gets about thirteen hours of daylight in mid-September. By the shortest day it is down to roughly seven and a half. Ireland sits far enough north, level with Labrador and above almost all of mainland Europe, that the drop is steeper here than most people expect.
Winter advice for older adults is usually about warmth, vaccines and not slipping on the ice, and the assumption underneath it is that dark mornings make you sad. The more useful truth is that dark mornings make your body clock vague, and a vague body clock shows up as broken sleep, flat afternoons and no motivation long before it ever looks like depression.
TL;DR
- Dublin loses around five and a half hours of daylight between mid-September and the winter solstice, with the clocks going back on 25 October 2026.
- The ageing eye is the part nobody mentions: the lens yellows and the pupil narrows, so transmission of the 480nm blue light your body clock reads falls by roughly 72% between age 10 and age 80.
- Classic seasonal affective disorder becomes less common with age, so persistent winter low mood after 60 deserves a proper look rather than a seasonal label.
- Retirement quietly removes the morning commute, which for many people was their only reliable dose of outdoor morning light.
- An overcast Irish morning outdoors still delivers far more usable light than a well-lit sitting room. Twenty minutes outside before noon is the highest-value change most people can make.
A latitude problem, not a weather problem
Greyness is a nuisance, but it is not what moves the body clock. The length of the dark is. When the clocks go back on 25 October 2026, sunset in Dublin moves to just after five, and by late November it is before half four. For anyone whose day starts slowly and whose outings happen in the afternoon, it becomes genuinely possible to go a full week without being outdoors in real daylight.
The same winter, a different eye
Your eyes do two jobs. One is seeing. The other, handled by a small population of light-sensitive cells in the retina, is telling your brain what time it is. Those cells are tuned to short-wavelength blue light at around 480nm, and they are the reason morning light sets your sleep timing, your alertness and, indirectly, your mood.
Both jobs get harder with age, but the timekeeping job gets harder faster. The lens of the eye yellows steadily across life and absorbs precisely the blue end of the spectrum those cells depend on: transmission at 480nm falls by around 72% between the ages of 10 and 80. The pupil narrows too, the change ophthalmologists call senile miosis, cutting the light reaching the retina again. Researchers estimate a 45-year-old retains roughly half the circadian light sensitivity of early youth, and it keeps falling from there.
Your body clock has not stopped working. It is reading a dimmer signal from the same room, and the light that comfortably anchored your rhythm at 30 may not register at 70. Cataract adds another layer: people who have had a cataract lens replaced show more stable rest and activity rhythms and better sleep than those who have not, which is a good argument for not putting off an eye assessment.
Why it is probably not classic SAD
Seasonal affective disorder is a real diagnosis: depression that reliably arrives in autumn and lifts in spring. It is also, counter-intuitively, a condition of younger adults. Onset is most common between 18 and 30, prevalence declines with age, and among older adults the overall burden drops well below that of people in their twenties.
So if you are 68 and flat every winter, “it’s just the SAD” is among the least likely explanations and the one most likely to delay something useful. Most of the alternatives come back on a single blood test: an underactive thyroid, low B12 or iron, vitamin D deficiency, and the sedating or mood-flattening side effects of common medicines. Depression that is not seasonal at all also deserves naming. It does not become less treatable because it happens to be November.
One more factor no blood test will catch: retirement removes the commute. For decades, walking to the bus at eight was a daily, non-negotiable dose of outdoor light that nobody thought of as health behaviour. Take it away and the first winter afterwards can feel inexplicably worse than any winter before it.
Light first, and light early
The most effective intervention is also the cheapest, and people underestimate it because indoor lighting feels bright. It is not. A well-lit sitting room runs at perhaps 100 to 300 lux; a heavily overcast Irish morning outdoors still delivers roughly 1,000 to 4,000 lux, and a bright one far more.
So: get outdoors for twenty to thirty minutes before noon, ideally within an hour or two of waking, and do it on the grim days rather than only the pleasant ones. The grim days are the ones that count. Walking is ideal because it stacks light with movement and, if you go with someone, with company. If mobility makes that hard, sitting by the brightest window is a genuine second best.
When a light box earns its place
Light therapy has a decent evidence base: the effect in seasonal depression is large, and a 2024 review found bright light useful as an add-on in non-seasonal depression too. The standard protocol is a 10,000 lux box at roughly 30cm for 20 to 30 minutes in the morning, eyes open but not looking directly at it.
Talk to your GP first if you have an eye condition such as macular degeneration or retinopathy, if you have bipolar disorder, where bright light can trigger a switch in mood, or if you take a photosensitising medicine such as amiodarone. And treat St John’s Wort as a drug rather than a herbal extra: it interacts significantly with anticoagulants and antidepressants.
The rest of it
Light does not work alone. Cold houses flatten mood as reliably as darkness does, so settle the Fuel Allowance question early: the 28-week season reopens in late September, with dates on gov.ie and MyWelfare. Keep one fixed commitment in the diary each week, because winter erodes the informal ones first. Active Retirement Ireland, Men’s Sheds and ALONE’s befriending service exist for precisely the months when it is easier to stay in.
When to talk to your GP
Book an appointment if low mood has lasted more than two weeks, if it is affecting sleep, appetite or your ability to manage day to day, if you have lost interest in things you normally enjoy, or if this winter feels worse than previous ones. Bring a list of your medicines and ask for bloods. Aware runs a free support line on 1800 80 48 48, 10am to 10pm daily, and Samaritans are on 116 123 around the clock.
The dark is coming either way. What you can change is how much of the remaining light actually reaches you, and for most people that is considerably more than reaches them now. At Críonna Health we keep returning to the same unglamorous point: the small daily things done in September tend to decide how February feels.
This article is general information, not individual medical advice. If you are concerned about your mood, speak to your GP.
