Tired, grumpy, always hungry Why grey-skies syndrome may be to blame…

and the usual average of 65.4.

While sunshine normally increases dramatically in March — the average is 101.7 hours — there were only 45.9 hours of sunshine up until the 17th.

This follows last year’s bad summer, the least sunny for 25 years.

Some people may be more prone to the winter blues or SAD. A recent study from the University of Virginia suggested a genetic mutation in the eye may make sufferers less sensitive to light.

The study, which involved 220 people with SAD and 130 with no mental illness, found the SAD patients had lower levels of a receptor that helps regulate alertness and the 24-hour body clock.

The risk with winter blues is that it can develop into SAD.

Winter blues sufferers can still function, but they find it harder to wake up and get going in the mornings, even though normally they have slept longer than usual

Winter blues sufferers can still function, but they find it harder to wake up and get going in the mornings, even though normally they have slept longer than usual

‘These sufferers are at the more extreme end of the spectrum of winter blues and their depression is more severe,’ says Professor Thompson.

‘They are more likely to need medical treatment.’

Under guidelines from the National Institute for Clinical Excellence (NICE), SAD should be treated like depression — with psychological therapies and antidepressants known as selective serotonin reuptake inhibitors (SSRIs), thought to boost serotonin levels.

Light therapy with a SAD lamp is also beneficial, says Professor Thompson, who is also president of the International Society for Seasonal Affective Disorder.

The lamps simulate summer light conditions so melatonin levels are reset to the amount produced in the summer.

A bright, sunny day provides around 100,000 LUX (the measure of brightness) — typical indoor domestic lighting only has 200-500 LUX, so most people use SAD lamps with 10,000 LUX.

The advice is to use the lamps daily for varying periods, depending on light intensity in autumn and winter, but also in summer if there is no sun.

However, you have to buy or hire lamps privately as NICE says there isn’t enough evidence to support long-term use.

When it comes to winter blues, symptoms usually aren’t severe enough to warrant medical treatment unless they are making other health problems worse, says Professor Farmer.

‘The danger is that if you go to your GP with winter blues, you may be prescribed antidepressants because it’s the easiest and quickest thing they can do to help you.

‘But actually, for mild depression you might be better off having psychological therapies, including cognitive behavioural therapy (CBT).

'Even this late in the season, CBT is worth considering because if you have a recurring problem it will give you a tool kit and strategies for dealing with it next time.

‘Getting outdoors for at least an hour a day is also good for winter blues — preferably at midday when the sun is brightest, but any time spent outdoors is better than none.

'Try to get out in your lunch hour; it may seem like a small thing, but it will make a difference.

'Exercise helps too. The herbal remedy St John’s Wort has also been shown to be effective in treating mild to moderate depression.

'However, it does interact with a number of prescription drugs including the contraceptive pill, HRT and warfarin, so check with your doctor if you are already taking medication.’

Professor Farmer warns that different brands have different strengths, ‘so stick to the same one so you get a consistent dose to keep your symptoms under control’.

St John’s Wort also cannot be taken at the same time as light box therapy because there is a risk of photosensitivity.

Not everyone is convinced that the winter blues exist. Swedish-born psychiatrist Dr Lars Davidsson, medical director of the Anglo European Clinic in London, says some symptoms are just part of winter.

‘I don’t necessarily feel it’s a medical illness to feel a bit down about the winter. It’s just part of life and you have to get on with it.

‘Obviously if the symptoms start to have a severe impact on your life, you may have full-blown SAD, and that is quite different.’

When Felicity’s work started to suffer, she decided it was time to take action and in December she started taking St John’s Wort.

‘I began to cheer up after a few weeks and came out of hibernation mode,’ she says.

‘I now find it easier to get up in the mornings.

‘I still have carb cravings, but I’m controlling my eating habits.

'I’m also getting out more in daylight hours by walking from the station to work and getting out at lunchtime.

‘I put my symptoms purely down to the bad weather — and like most people I’m hoping spring is just around the corner.’