If you do, don't worry! The winter weather can affect us all - but the NHS has issued advice online on how to combat the fatigue you face in the colder months.
Here are five energy-giving solutions that may help you – and some conditions that can sometimes be the cause.
1. Let in some sunlight
As the days become shorter, your sleep and waking cycles may become disrupted. The lack of sunlight means your brain produces more of a hormone called melatonin, which makes you sleepy.
Open your blinds or curtains as soon as you get up to let more sunlight into your home, and get outdoors in natural daylight as much as possible. Try to take even just a brief lunchtime walk, and make sure your work and home environments are as light and airy as possible.
2. Get a good night's sleep
Getting enough undisturbed sleep is vital for fighting off winter tiredness.
It's tempting to go into hibernation mode when winter hits, but that sleepy feeling you get doesn't mean you should snooze for longer.
In fact, if you sleep too much, chances are you'll feel even more sluggish during the day. We don't actually require any more sleep in winter than we do in summer – aim for about eight hours of shut-eye a night, and try to go to bed and get up at the same time every day.
Make sure your bedroom helps you feel relaxed and sleepy: clear the clutter, have comfortable and warm bedding, and turn off the TV.
Read more about how to get a good night's sleep.
3. Get regular exercise
Exercise may be the last thing you want to do when you're feeling tired on dark winter evenings. But you might be surprised by how energetic you feel after getting involved in some kind of physical activity every day.
Exercise in the late afternoon may help to reduce early-evening fatigue and also improve your sleep. Try to reach the recommended goal of 150 minutes of exercise a week.
Winter is a great time to experiment with new and different kinds of activity.
For instance, if you're not used to doing exercise, book a session at one of the many open-air skating rinks that open during the winter. Skating is good all-round exercise for beginners and aficionados alike. There are also many dry ski slopes and indoor snow centres in the UK, which will offer courses for beginners.
If you're feeling like being more active, go for a game of badminton at your local sports centre, or a game of tennis or five-a-side football under the floodlights.
If you find it hard to get motivated to exercise in the colder, darker months, focus on the positives – you not only will feel more energetic but might also stave off winter weight gain.
Read lots more tips for exercising in winter.
4. Learn to relax
Are you feeling pressured to get everything done during the shorter daylight hours? If so, it may be contributing to your tiredness – stress has been shown to make you feel fatigued.
There's no quick-fire cure for stress, but there are some simple things you can do to help to reduce it. Many people find adding meditation, yoga, breathing exercises or mindfulness techniques into their day helps them to calm down and feel more relaxed.
Find out more by checking out these 10 ways to reduce stress.
5. Eat the right food
Being overweight or underweight can affect your energy levels and leave you feeling sleepy. So it's important to make sure you eat a healthy, balanced diet.
Once the summer ends, there's a temptation to ditch the salads and fill up on starchy foods such as pasta, potatoes and bread. However, you'll have more energy if you include plenty of fruit and vegetables in your comfort meals.
Winter vegetables – such as carrots, parsnips, swede and turnips – can be roasted, mashed or made into soup to provide a warming winter meal for the whole family. And classic stews and casseroles are great options if they're made with lean meat or pulses, and plenty of veg.