Is seasonal depression real?

Yes, seasonal depression is real. It's diagnosed when you feel depressed most days during the same season for at least two years in a row, and more often in that season than the rest of the year.^[1] Doctors call it major depression with a seasonal pattern. Most of us know it as seasonal affective disorder, or SAD.

For most people it starts in late fall or early winter and lifts in spring. It's much more common in women and in people who live farther north.

So why do people still ask if it's real? Part of the reason is a 2016 study of 34,294 US adults that found no link between depression and the seasons.^[2] However, that survey only asked how people had felt over the past two weeks. A two-week snapshot can't show a pattern that comes back every winter, and the authors noted that a condition this uncommon is hard to catch in a big survey.

A survey built to look for the pattern found it. When NIMH researchers surveyed adults in Montgomery County, Maryland, 92% said the seasons shifted their mood or behavior, and 27% said the shift was a problem. Between 4.3 and 10% were affected as badly as people diagnosed with seasonal depression.^[3] So seasonal depression is the far end of a change most of us feel to some degree.

Winter blues or seasonal depression: how can you tell?

Most people who feel flat in December have the winter blues. The difference comes down to how long it lasts, how much of your life it affects and whether it comes back every year.

What do shorter days do to your body clock and sleep?

Your body clock sets itself by light, and in late fall there's less of it. Sunrise comes later and evenings close in early.

A 2001 NIMH study shows what that does. Researchers measured melatonin, the hormone that tells your body it's night, in 55 people with seasonal depression and 55 without it, once in winter and once in summer.^[4] In people with seasonal depression, melatonin ran for 9.0 hours a night in winter and 8.4 hours in summer. It didn't change in healthy volunteers.

So their bodies kept a longer night in winter. The study can't prove that's what causes the depression, but it fits what people with winter depression describe: sleeping more, craving carbs and wanting to hibernate.^[1]

Does the clock change make seasonal depression worse?

It probably matters less than you'd think. The hour itself does little to your sleep in the fall. What it changes is when your daylight comes. Sunrise and sunset both move an hour earlier on the clock, so mornings get a little lighter and evenings go dark sooner.

A Michigan State study of US time-use data found that workers slept 40 minutes less on the Monday after the spring change, but no significant difference after clocks fell back.^[5] If you leave work at five, though, the clock change took you from heading home at dusk to heading home in the dark.

So if you've felt heavier since the clocks changed, the hour you gained probably isn't why. The earlier dark is the likelier reason, and it stays until the clocks move again in March.

What helps with seasonal depression?

Light therapy, CBT and medication have held up in studies. Vitamin D hasn't, so far.

A light box isn't for everyone. If you have an eye condition, or take a medication that makes you sensitive to sunlight, use one only under your doctor's supervision. Light therapy can also trigger hypomania, a wired, sleepless high, especially in the first few days.^[7] If you've ever been diagnosed with bipolar disorder, talk to your doctor before you start.

Each of these works on one piece of the problem. A light box gives you 30 minutes of bright light each morning, CBT works on your thoughts and habits, and medication works on brain chemistry. However, seasonal depression reaches further. When your body clock shifts, your sleep, energy and appetite shift with it, and many people crave carbs and put on weight through the winter. So the rest of your day matters too, starting tomorrow morning.

• Get outside within an hour of waking. Open the blinds, step onto the porch or take your first call by the brightest window.

• Wake up at the same time every day, weekends included.

• Move while it's light. A lunchtime walk gives you daylight and movement in one go.

Ayurvedic Science builds its whole day around the same idea. Its daily routine, dinacharya, sets waking, meals and sleep by the sun, with the biggest meal at midday and a lighter, earlier dinner. Its seasonal routine, ritucharya, changes what and when you eat as the seasons turn, because your digestion and cravings don't stay the same all year. At LYBL, your holistic health physician builds that kind of routine with you.

How LYBL supports seasonal low mood and sleep

While a light box takes care of 30 minutes, our Anxiety and Depression program looks after the rest of your day. Your care team includes board-certified MDs, Holistic Health Physicians, nutrition experts and yoga therapists, and they look at your sleep, digestion, hormones and stress as well as your mood.

Here's what you get:

• A free one-on-one consultation of up to 60 minutes with a Holistic Health Physician, after you take the health assessment.

• A personalized plan on your LYBL web dashboard, covering what to eat and when, how to move and how to wind down at night.

• Targeted formulations, delivered monthly, blended from standardized extracts of herbs like brahmi and shankhapushpi to support a calm mind and clear focus, even on the shortest days of the year.

• Yoga therapy and dietary recommendations tailored to you by certified yoga therapists and nutrition experts.

• A 30-minute follow-up with your physician every month, plus chat support and community threads in between.

That monthly follow-up matters in winter. The plan you start in November can change in December and again in February, as the days shorten and then lengthen. It works alongside your light box, therapist or prescriptions. Leave 45 to 60 minutes between your prescribed medicines and our formulations.