Low mood that deepens from October, waking in the dark, and no energy for anything — layered on top of a transition that is already affecting sleep and mood. Seasonal changes and perimenopause compound each other, and separating them matters because they respond to different things.

Where we stand: Menova is an independent publication. We sell no lamps and no supplements, we are not your doctor, and this is general education, not medical advice.

The two patterns

Seasonal affective disorder (SAD) is a recognised pattern of depression that recurs at the same time each year, typically starting in autumn and lifting in spring. Its features are somewhat distinctive: sleeping more rather than less, increased appetite with carbohydrate craving, weight gain, and a heavy, leaden fatigue.

Perimenopausal mood change tends toward broken sleep rather than oversleeping, irritability and anxiety, and it tracks the cycle rather than the calendar.

They can coexist, and when they do the winter is genuinely harder than either alone.

The useful question: has this happened in previous winters, and did it lift in spring? A pattern across years points at the seasonal component; a change that began this year alongside cycle changes points at the transition.

Why winter compounds it

  • Less daylight shifts circadian rhythm, and circadian disruption is already a feature of the transition — see perimenopause sleep problems
  • Vitamin D falls, since skin synthesis effectively stops at higher latitudes in winter months — see vitamin D and calcium
  • Activity drops, and exercise is one of the more reliable levers for mood
  • Social contact drops, which matters more in this life stage than people credit — see friendships in midlife
  • Alcohol intake often rises, which worsens sleep, mood and hot flashes — see alcohol in midlife
  • Carbohydrate craving in SAD adds to the cravings already common in perimenopause — see sugar cravings in perimenopause

One genuine consolation: hot flashes are often more bearable in winter, since a cool ambient temperature keeps you further from the trigger threshold — see getting through summer.

What helps the seasonal component

Light in the morning. The most evidence-based intervention for SAD.

  • Bright light therapy, typically a 10,000 lux box used for 20 to 30 minutes shortly after waking, at the recommended distance, with eyes open but not looking directly at it
  • Use it early. Later in the day it can delay sleep
  • Consistency matters — most days, through the season
  • Effects usually appear within one to two weeks

Cautions worth knowing: speak to a clinician first if you have bipolar disorder (light can trigger mania), an eye condition, or take photosensitising medication.

Get outside early, even on a grey day. Outdoor light on an overcast morning is far brighter than indoor lighting, and it costs nothing.

Keep a consistent wake time, which anchors circadian rhythm more than bedtime does.

Exercise, ideally outdoors and in daylight — see strength training in menopause.

CBT has evidence in SAD, with some research suggesting longer-lasting benefit than light therapy alone, and it also has evidence in menopausal symptoms — see CBT for menopause.

Vitamin D, where deficient. Correcting deficiency is worth doing for bone regardless; the evidence for supplementation improving mood is weaker than commonly claimed.

Antidepressant medication, where the depression is significant.

Do not skip the physical causes

Winter tiredness is a sufficient-sounding explanation, which is exactly why treatable causes get missed during it:

Ask for these together — see reading your own blood test results.

When it is depression needing treatment

Get assessed if, for two weeks or more:

  • Low mood most days, most of the day
  • Loss of interest or pleasure in nearly everything
  • Hopelessness, or feeling worthless
  • Significant change in sleep or appetite beyond the seasonal pattern
  • Difficulty functioning

Perimenopause independently raises the risk of a depressive episode, particularly with a previous history of depression or postnatal depression. A history of bipolar disorder raises the risk of a significant episode and changes what treatment is appropriate.

Seek help immediately for any thoughts of harming yourself — emergency services or a crisis line in your country.

See mood and anxiety in menopause.

Where hormone therapy fits

Hormone therapy is not a treatment for seasonal affective disorder and is not an antidepressant.

Where it can help indirectly: if broken sleep from night sweats is part of what makes winter unmanageable, treating that removes one of the two causes. Women often describe winter as more tolerable once they are sleeping — which is the sleep, not a seasonal effect.

If your mood is worse specifically in the progestogen phase, that is a signal to change the progestogen rather than to abandon treatment — see is my dose too high or too low and progesterone in menopause.

Practical for the season

  • Morning light first, before screens
  • Fixed wake time, weekends included
  • Something scheduled and social each week — structure survives what motivation does not
  • Move exercise to daylight hours where possible
  • Reduce alcohol, which is the most available and least effective winter coping tool
  • Plan for the dip, if you know it comes. Booking things in January is easier in November
  • Do not stop going out because it is dark and you are tired. That is the loop

What to say

"I get low every winter — sleeping more, no energy, craving carbohydrate — and this year it's worse alongside perimenopausal symptoms. I'd like to discuss both. Could we check thyroid, ferritin, B12 and vitamin D, and talk about light therapy or CBT?"

Naming both keeps both on the table, which is the difficulty here.

Our free 30-day symptom tracker lets you see whether mood tracks your cycle or the season, and the free printable visit prep sheet turns it into one page.

The free 2-minute Menova self-check organizes your symptom picture — no account, not a diagnosis, and your answers never leave your device.

This article is general education, not medical advice. Speak to a licensed clinician before using light therapy if you have bipolar disorder, an eye condition, or take photosensitising medication. If you have persistent low mood, or any thoughts of harming yourself, seek help promptly.

Sources: NIMH — Seasonal Affective Disorder, NIH Office of Dietary Supplements — Vitamin D, The Menopause Society, and NHS — Seasonal Affective Disorder.