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Why Depression Makes you Tired
Updated: Sep 5
Depression can make you exhausted in a way that is difficult to explain to someone who has never experienced it.
You may sleep for eight hours and still wake up feeling as though you have barely rested. Getting dressed can feel like an accomplishment. Answering a text message may require more effort than it normally would. Even things you usually enjoy can seem to require energy that you simply do not have.
And sometimes the hardest part is not knowing why.
Depression is not only about feeling sad. It can affect sleep, concentration, motivation, physical activity, appetite, thinking, and the way your body responds to stress. Fatigue is common in depression and can remain even when some other symptoms have started to improve (González-Blanco et al., 2025).
So why does depression make you so tired?
There is no single answer. Several processes can overlap, and they can reinforce one another.
Depression Can Affect Your Energy in Several Different Ways
It is tempting to explain depression as a problem with brain chemicals such as serotonin or dopamine. Those neurotransmitters are certainly involved in brain functioning, but current research does not support the idea that depression is simply caused by having “low serotonin.”
Depression is a complex and biologically heterogeneous condition. Researchers are studying interactions among brain networks, neurotransmitters, stress-response systems, immune and inflammatory processes, metabolism, sleep, genetics, and environmental experiences (Fried et al., 2023; McIntyre et al., 2023).
That complexity matters because it helps explain why depression can look different from one person to another.
For one person, exhaustion may be closely connected to severe insomnia. Another person may sleep excessively and still feel drained. Someone else may be exhausted primarily because concentrating, making decisions, and managing emotions have become so difficult.
Sleep Can Leave You Feeling Exhausted
One of the clearest connections between depression and fatigue involves sleep.
Depression can be accompanied by difficulty falling asleep, waking during the night, waking too early, or sleeping much more than usual. Some people experience several of these problems at the same time.
Even when you are spending plenty of time in bed, your sleep may not feel restorative.
Research examining sleep architecture in depression has found measurable differences in sleep patterns, including changes involving REM sleep and the continuity and structure of sleep (Zhang et al., 2025). Persistent insomnia can also remain after other depressive symptoms have improved and is associated with poorer functioning and prognosis (Kwaśny et al., 2023).
This can create a frustrating cycle. You are exhausted, so you have less energy during the day. You become less active, which can affect your sleep and mood. Poor sleep then makes the following day even harder.
If sleep is a major part of your depression, it deserves attention rather than being treated as an unavoidable side effect of feeling depressed.
Cognitive behavioural therapy for insomnia, or CBT-I, is one evidence-based treatment for persistent insomnia, and research suggests that treating insomnia can also have benefits for depressive symptoms (Lin et al., 2023).
Your Brain May Be Working Much Harder Than It Looks
Depression can make ordinary mental tasks surprisingly demanding.
Making a decision can take much longer. Concentrating on an email can feel exhausting. You may read the same paragraph several times without taking it in. Conversations that once felt easy may require intense effort.
Rumination can add to this cognitive load.
When your mind repeatedly goes over the same painful memories, worries, regrets, or questions, you may feel mentally busy even when you are physically doing very little.
Depression can also affect motivation and reward processing. Activities that once gave you pleasure or a sense of accomplishment may no longer provide the same emotional response. This can make it much harder to initiate tasks, particularly when the task does not feel rewarding.
From the outside, this can look like laziness or a lack of effort.
From the inside, it can feel like trying to push your way through deep mental resistance.
Depression Can Change the Way Your Body Responds to Stress
Depression also has biological effects that extend beyond mood.
Research increasingly points to interactions between the brain, immune system, stress-response systems, and metabolism. In some people with depression, inflammatory markers are elevated, although this is not true for everyone and inflammation does not explain depression as a whole (McIntyre et al., 2023; Kuring et al., 2023).
Researchers have also identified subgroups of people with depression who experience a combination of fatigue, increased sleep, changes in appetite, and metabolic or inflammatory differences. This is one reason researchers increasingly describe depression as biologically heterogeneous rather than assuming that everyone experiences the same underlying process (McIntyre et al., 2024).
This research is promising, but it does not mean that your fatigue can automatically be explained by inflammation.
Depression-related fatigue can have many contributing factors, and physical health conditions can cause similar symptoms.
When Everything Feels Like Too Much Work
Depression can also change how much effort everyday activities require.
Showering. Cooking. Returning a phone call. Going to work. Picking up groceries. Getting the children ready for school.
These may seem like small things when you are feeling well. During depression, they can feel enormous.
When motivation is low, people often become less active. They may stop doing activities that previously gave their day structure, connection, or pleasure. That can lead to even less energy and reinforcement of depressive symptoms.
This is one reason behavioural activation can be helpful.
Rather than waiting until you feel motivated enough to become active, behavioural activation involves gradually reconnecting with meaningful or rewarding activities in manageable ways. A major 2026 systematic review and meta-analysis of 105 trials involving almost 14,000 participants found behavioural activation to be an effective treatment for adult depression, with benefits maintained in many analyses at 12 months (Cuijpers et al., 2026).
That does not mean you need to force yourself into a packed schedule when you are severely depressed.
The principle is much gentler: sometimes action has to come before motivation.
You might begin with something as small as taking a shower, sitting outside for ten minutes, preparing a simple meal, walking around the block, or calling someone you trust.
The goal is not to become productive.
The goal is to begin reconnecting with life.
Movement Can Help, Even When You Are Exhausted
Exercise is not a replacement for professional treatment when you are experiencing significant depression, but research suggests it can be an effective part of treatment.
A 2024 systematic review and network meta-analysis examined 218 randomized trials involving more than 14,000 participants and found that exercise was associated with meaningful reductions in depressive symptoms across several types of activity (Noetel et al., 2024).
That does not mean you need to start training for a marathon.
When depression has taken away your energy, the most useful starting point may be very small. A short walk, gentle stretching, gardening, or simply getting outside can be a reasonable beginning.
Some days, five minutes may be all you can manage.
That still counts.
The important thing is not to turn movement into another reason to criticize yourself. Depression already has a way of telling people they are not doing enough.
What Can You Do When Depression Has Taken Your Energy?
When you are exhausted, advice to “take care of yourself” can feel frustratingly vague.
It may be more helpful to think in terms of reducing the amount of energy your day requires while gradually adding things that support recovery.
Try giving your day some structure, even if that structure is very simple. Eat something reasonably nourishing rather than expecting yourself to prepare elaborate meals. Keep necessary tasks as manageable as possible. Make important decisions when you have the most energy. Allow yourself to rest without turning rest into another reason to feel guilty.
And if movement feels possible, start very small.
You do not have to wait until you feel motivated.
At the same time, you do not have to handle depression through lifestyle changes alone. Psychotherapy is an evidence-based treatment for depression, and behavioural activation is one of several psychological approaches that can help (Cuijpers et al., 2019; Cuijpers et al., 2026).
Depending on your circumstances, medication may also be appropriate and can be discussed with a physician or other qualified prescriber.
When Fatigue Needs a Closer Look
Although fatigue is common in depression, it should not automatically be assumed to be caused by depression.
Anemia, thyroid problems, sleep disorders, medication effects, nutritional deficiencies, infections, chronic health conditions, and other factors can also contribute to significant tiredness.
If your fatigue is severe, persistent, new, or out of proportion to your other symptoms, it is worth discussing it with a healthcare professional.
It is also important to seek professional help if depression is interfering substantially with your ability to work, care for yourself, maintain relationships, or function day to day.
And if you are experiencing thoughts of suicide or of harming yourself, seek immediate professional support or emergency assistance rather than trying to manage those symptoms on your own.
You Are Not Lazy Because You Are Exhausted
One of the most painful parts of depression can be the way fatigue gets interpreted as a character flaw.
You may look around and see other people working, exercising, socializing, keeping their homes clean, and getting things done. Meanwhile, getting out of bed feels like a major undertaking.
That comparison can create shame, which adds another layer of emotional weight.
Depression-related fatigue is not a moral failing.
It is a symptom that deserves attention and care.
Recovery does not necessarily begin with suddenly finding a huge reserve of energy. Often, it begins by understanding what is getting in the way and making small, realistic changes while receiving appropriate support.
Depression Therapy at Authentic Living London
If depression has left you feeling exhausted, unmotivated, disconnected, or unable to keep up with everyday life, therapy can provide a place to understand what is happening and begin working toward change.
At Authentic Living London, Sandra Graham works collaboratively with clients experiencing depression and the many ways it can affect daily life. Therapy can provide space to explore difficult emotions, understand patterns that may be maintaining depression, develop practical coping strategies, and gradually reconnect with activities and relationships that matter to you.
You do not have to wait until you have more energy before asking for help.
Sometimes getting support is the first step toward finding some of that energy again.
If you are looking for depression therapy in London, Ontario, Authentic Living London offers in-person and virtual counselling. You can call or text 226-224-0301 or email info@authenticlivinglondon.com to learn more or arrange a consultation.
Working with Sandra Graham
At Authentic Living London, Sandra Graham, Registered psychotherapist-qualifying, BSc, MACP is a compassionate therapist who understands how deeply depression can affect your energy, motivation, and quality of life. She works collaboratively with clients, offering both practical coping tools and a safe, non-judgmental space to process difficult emotions.
Sandra helps you address both the emotional weight of depression and its physical effects, supporting you in gradually restoring balance and energy to your life. If fatigue is keeping you from living the life you want, Sandra can help you take the first steps toward recovery, at your own pace.
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