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Why am I always tired? Understanding tiredness & fatigue
Written byJodi M Johnson
Reviewed byHeeral Tomlinson
Always yawning but rest doesn’t help? Fatigue isn’t the same as being tired. Understanding the difference can help you reclaim your energy and work out what your body really needs
Summary
1What is fatigue?
Fatigue can come from many different places and it’s rarely just one simple cause.
2Lifestyle changes to support energy
A balanced diet and regular movement, along with keeping fairly consistent sleep times can help.
3Foods that may help with energy
Nourishing options like whole grains, fruit, protein and healthy fats can help you feel more energised.
Ever notice how you can feel completely wiped out while someone else seems full of energy? It’s easy to assume you’re just ‘more tired’, but there could be more going on. While genetics can influence how we experience energy and fatigue, they’re only one small piece of the puzzle. Lifestyle, stress, sleep quality, health and daily demands all play a role too. Understanding the difference between feeling tired and experiencing true fatigue can help make sense of what your body is really asking for – and what might actually help.
What’s the difference between fatigue and tiredness?
Tiredness, or daytime sleepiness, and fatigue are often mentioned together, but they’re not the same thing. Daytime sleepiness is just what it sounds like: a strong urge to fall asleep.1,2 Fatigue, on the other hand, feels more like being drained or worn out, even if you’re not actually sleepy.1,2
One key difference between the two is how they respond to rest. Sleepiness usually builds up as the day goes on and eases after a good sleep, but fatigue doesn’t work that way – it can linger even after you’ve rested.1,2 Recognising which one you’re experiencing is an important step towards getting the right kind of support and feeling better.
What is fatigue?
When rest doesn’t seem to restore your energy, it’s natural to wonder what’s really going on. Fatigue can come from many different places and it’s rarely just one simple cause. For some people, differences in how their bodies produce and use energy may play a role. Some people have genetic differences that can change how well their cells turn food into energy, especially when fuel levels drop, like during physical activity.3,4
“Beyond genetics, a wide range of physical and mental health factors can affect how much energy you have”
If your body struggles to access energy properly, it can leave you feeling wiped out, even during rest. Beyond genetics, a wide range of physical and mental health factors can affect how much energy you have. Things like anaemia, fibromyalgia or an underactive thyroid are commonly linked with ongoing fatigue. If you think you have these things or are experiencing ongoing fatigue, it is important not to self-diagnose and speak to your doctor.
Low iron levels may contribute to anaemia, which can leave you feeling worn out. Including iron-rich foods such as lean red meat, beans, leafy greens or broccoli may be supportive for some people, and supplements are sometimes recommended under medical guidance. For people, fatigue can be part of a wider mix of symptoms that vary from day to day. In all cases, persistent or unexplained tiredness is worth taking seriously.5
Your internal body clock can also play a role in how fatigued you feel. Many of us spend most of the day indoors under artificial lighting, which means we’re not getting the natural daylight our bodies use to regulate sleep and wake cycles. Over time, this can disrupt sleep patterns and affect sleep quality, sometimes making it harder to fall asleep or stay asleep. When sleep is consistently off, ongoing tiredness can easily follow.6
If you’re dealing with ongoing tiredness that doesn’t improve with rest or feels worse after physical activity, it may be a sign that something more is going on. It’s a good idea to speak with a GP if you’ve been feeling tired for a few weeks and you’re not sure why or if it’s starting to affect your daily life.7 You should also seek advice if your tiredness comes with other changes, like unexplained weight loss, shifts in your mood or if someone has noticed things like gasping or choking sounds while you sleep.7,8 Doctors can help explore possible causes, rule out other conditions and support you in finding the right next steps.
“Many people find that allowing roughly seven to nine hours of sleep works well”
Why am I waking up tired?
If you’ve been waking up feeling more tired than you’d expect, you’re not alone. Here are a few common things that might be contributing to low energy in the morning:
Most of us rely on an alarm to get us up in the morning but sometimes, that loud wake-up call can actually leave us feeling more tired. Towards the end of our sleep cycle, our bodies naturally begin to wake themselves by shifting into lighter sleep, helping us feel more alert when morning comes.9 The problem is that alarms don’t always line up with this process and may leave you feeling groggy and sluggish.
If you need to use an alarm, it can help to aim your bedtime around your natural sleep cycles. Many people find that allowing roughly seven to nine hours of sleep works well,10 so counting backwards from when you need to wake up can give you a better idea of when to start winding down. Or you might want to try a sunrise alarm clock, which gently wakes you by slowly brightening your room, mimicking a natural sunrise.
Feeling tired in the morning doesn’t always mean you didn’t get enough sleep. Sometimes it’s down to something called sleep inertia – the groggy, sluggish feeling that can happen as your brain transitions from sleep to being fully awake.11 This can explain why you might wake up feeling drained even after a solid eight hours.
For most people, sleep inertia fades within about 20–30 minutes, but for others it can linger longer. During that time, things like focus, reaction time and clear thinking may feel a bit off.12 It’s a normal part of waking up and giving yourself a gentle start to the day can help your body and mind catch up.
Certain sleep conditions can also affect how rested you feel in the morning. Insomnia, for example, often involves difficulty falling asleep, staying asleep or both.13 When sleep is frequently interrupted or shortened, it’s harder for your body to get the restorative rest it needs – so daytime sleepiness can start to build up.14
Insomnia can be short-term, often linked to stress or changes in routine, or it can last longer depending on what’s causing it.13 If sleep problems are happening at least a few nights a week for several months, it’s a good idea to talk to your doctor. They can help explore what’s behind it and suggest ways to improve your sleep and energy levels.
Anxiety and stress are closely linked and share the same brain systems, meaning they influence each other in a two-way relationship. Anxiety is essentially the body preparing for a possible future threat, putting you into a kind of ready state that affects both your mind and physical responses. In terms of energy, this state isn’t just emotional, it’s biological.
Put simply, anxiety can be thought of as your body’s energy system being tuned for alertness and anticipation, but when it stays switched on for too long, it can drain your mental and physical energy instead of helping you cope. Most people feel anxious sometimes, but if you feel anxious most of the time and it affects your everyday life, it's worth speaking to someone.15
Lifestyle changes to support energy
The NHS suggests there are a few gentle, everyday habits that can help if you’re feeling tired or fatigued. Like focusing on a balanced diet and regular movement, along with keeping fairly consistent sleep times and aiming for around six to nine hours of rest each night.7 It can also help to wind down in the couple of hours before bed, perhaps by reading or listening to music or a podcast, and to make your sleeping space as comfortable as possible, not too bright, noisy or warm.7
Limit sugary foods
Sugary foods can give you a quick burst of energy but it often doesn’t last. After a spike in blood sugar, energy can crash, leaving you feeling tired or sluggish. Opting for foods that release energy more slowly, like wholegrain bread, brown rice, oats or beans, can help keep your energy levels more stable throughout the day.
These lower gastrointestinal tract options give your body a steadier supply of fuel, which can make a noticeable difference in how alert you feel. The lower GI tract is the lower part of your digestive system. It plays an important role in breaking down food, absorbing nutrients and getting rid of waste from your body.16
Soak up the daylight
Spending time in natural daylight outside – especially in the morning – can help signal to your body that it’s time to be awake, supporting your natural sleep-wake cycle.17 You might expect to feel more energised in spring, with its lighter mornings and longer evenings. However, that isn’t always the case – getting enough daylight throughout the year is essential for supporting a healthy sleep–wake cycle.
Seasonal fatigue may also play a part. Many people experience seasonal affective disorder (SAD) which can affect your mood and your sleeping patterns18 – and did you know there’s such a thing as autumnal fatigue and hayfever fatigue?19
Regular movement or exercise
The more time we spend sitting still, the more sluggish we can feel. Low energy is often linked to fitness levels, but regular movement can help lift alertness, improve mood20 and even support stress balance by influencing hormones like cortisol.21
Foods that may help with energy
While no single food can fight fatigue, building a balanced morning routine with nourishing options like whole grains, fruit, protein and healthy fats can help you feel more energised and ready for the day. It’s the overall pattern of a healthy, varied diet that supports steady energy levels, rather than any one ingredient. If you’ve been feeling unusually tired for a few weeks, it’s a good idea to speak with a doctor to rule out any underlying cause.
Beetroot
Beetroot contains natural compounds called nitrates, which may help widen blood vessels and improve oxygen delivery to your muscles.22 Try it roasted with a little goat’s cheese and a sprinkle of walnuts for a tasty, energy-supporting snack or make this nourishing and vibrant beetroot and blueberry smoothie.
Hemp seeds
A sprinkle of hemp seeds can be a simple way to get fuel throughout the day. They’re packed with protein, fibre and essential fatty acids like omega-3 and omega-6.24 Try adding a spoonful to your cereal, smoothie or baked goods – it can even help slow the release of sugar from your food, keeping your energy levels more balanced.25
Vitamins for tiredness and fatigue
Vitamin B12
Vitamin B12 plays an important role in everyday bodily functions, including helping your body make new red blood cells and turning the food you eat into energy.26 You can find it in foods like eggs, salmon, cheese, meat, milk and fortified cereals.27 As B12 is mainly found in animal products, vegans and some vegetarians can be at risk of not getting enough. Low B12 levels can lead to fatigue and conditions like anaemia,28 so if you’re concerned, it’s a good idea to speak with your GP. They can advise whether a supplement or dietary changes might help.
Iron
Iron is often talked about in relation to low energy and women (particularly for those with heavy periods and who are more likely to have lower iron levels).29 Iron plays an important role in helping oxygen move around the body, which can affect how energetic you feel.30 However, because the body doesn’t easily get rid of excess iron, supplements aren’t something to take ‘just in case’.31 It’s best to speak to a doctor before taking iron supplements to ensure they're suitable for you.
FAQs
If you’re interested in herbal supplements, ginseng is one that’s been used for centuries. Some research suggests it may help support mental focus and reduce feelings of fatigue,32 though experiences can vary from person to person. Ginseng is available in several forms, including tablets and teas. It’s always a good idea to speak with a healthcare professional before starting any new supplement, to make sure it’s right for you.
Instead of reaching for a coffee, you could try matcha. This powdered green tea comes from leaves grown in the shade, which gives it a unique nutrient profile. It’s rich in antioxidants and contains an amino acid called L-theanine, which may help promote a sense of calm while keeping you alert.33 Try adding a scoop to a smoothie or a high-protein iced matcha latte for a gentle, tasty energy lift during the day. We’ve also picked out some favourites in this guide to more ‘natural’ energy drinks.
Ever feel ready for a nap right after a big meal? Meals that are high in fat, carbs or overall calories can sometimes make us feel sleepy.34 Eating smaller, balanced meals and snacks throughout the day can help keep your energy more consistent. Many experts suggest having four to six smaller meals, including healthy snacks, to support steady blood sugar levels.34
However, it’s absolutely okay to have three meals a day if that feels right for you. What really matters is your overall energy intake and the quality of the food you’re eating, rather than how often you eat. It’s also completely natural to feel a bit more tired after meals, as your body is using energy to digest and process your food.
The final say
Understanding the difference between tiredness and fatigue gives you back a sense of control. Waking up tired doesn’t mean you’re lazy – it’s often a signal that your sleep, stress levels, nutrition or daily rhythms need a little recalibration. Small, consistent changes really do add up. However, sometimes you may need additional help. If you’ve been feeling this way for a few weeks, visit your GP.
Inspired to support your energy levels? Take a look at our top products to support your energy or how you can avoid the dreaded 3pm energy slump.
Disclaimer – This article provides informational advice and is not a substitute for medical care. Curated by experts for accuracy, we take great care to ensure the information is up-to-date and relevant. However, you should always consult your GP or healthcare professional before using supplements or alternative products, particularly if you have medical conditions or are under supervision.
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