You know the feeling.
You’re not sleepy enough to go to bed.
You’re not ill.
Nothing is particularly wrong.
But opening the next document feels harder than it should. Replying to a message can wait. The dinner you were looking forward to suddenly sounds like effort.
You have enough energy to do the thing.
You just don’t particularly want to engage with it.
We tend to call all of this “tired”.
But tiredness, mental fatigue and low motivation aren’t necessarily the same experience.
And that distinction matters, because the solution depends on which one you’re actually dealing with.
Sometimes the problem is effort, not energy
Mental fatigue has increasingly been studied through the lens of effort, motivation and cognitive control.
One neuroscience review describes fatigue partly as a shift in how the brain weighs the expected benefit of continuing a task against the cost of exerting further cognitive control. Dopamine-related systems are involved in energising goal-directed behaviour and effort.[1]
Put less scientifically:
At 9am, finishing something difficult may feel worth the effort.
At 5pm, the same task can suddenly feel absurdly expensive.
The task hasn’t changed.
Your relationship to the effort has.
That may explain one of the strangest features of feeling flat: you can still do things you’re excited about.
You might stare at a spreadsheet for 15 minutes without starting, then instantly become animated when a friend suggests dinner.
That isn’t necessarily a lack of physical energy.
Dopamine is not a “happiness chemical”
Online conversations about motivation often reduce everything to dopamine.
Reality is less neat.
Dopamine is involved in reward learning, behavioural activation, effort and motivation, but it isn’t simply a dial labelled “motivation”. Reviews of motivation research describe it as part of a much broader network involved in deciding whether something is worth pursuing and how much effort to expend.[2]
That’s more useful than the pop-science version because it helps explain a common experience:
feeling flat can look like reduced willingness to engage, even when you’re physically capable of doing so.
Sleepy
“I could fall asleep.”
Mentally fatigued
“My brain has had enough.”
Unmotivated
“I can do it. I don’t want to.”
Overstimulated
“I’m awake, but I can’t settle into anything.”
Most bad afternoons are not just one box.
Why “push harder” often makes it worse
When motivation drops, the instinct is often to increase pressure.
Another coffee.
Louder music.
A harder deadline.
Tell yourself to stop being lazy.
Sometimes that works.
Sometimes the brain interprets the task as even more costly.
A systematic review of ways to counter mental fatigue found potential benefits from interventions ranging from caffeine to music and external motivation, but also highlighted how varied the evidence is and how little we still know about the underlying mechanisms.[3]
Which is a reassuringly unglamorous conclusion:
There probably isn’t one hack.
What actually helps when you feel flat?
First, work out what you’re asking your brain to recover from.
Change the task
If you’ve spent three hours writing, do something administrative. If you’ve spent all day reacting to messages, turn everything off and do one deep task.
Different cognitive demands can feel surprisingly different.
Make the first step embarrassingly small
Don’t “finish the deck”.
Open it.
Write one slide.
Answer one email.
Starting changes the calculation.
Move
A walk is underrated partly because it sounds too simple. Changing environment, increasing movement and getting away from the screen can interrupt the state you’ve been sitting in for hours.
Add reward
Work somewhere you like. Put music on. Do the difficult thing before something you genuinely want to do.
Motivation responds to what the effort is for.
Cancel something
Not every low-social-energy evening needs optimisation.
Sometimes you genuinely don’t want to go.
That is allowed.
Where nutrition and supplements enter the picture
The biochemistry of motivation and fatigue is one reason some performance formulas include amino acids involved in catecholamine pathways.
L-Phenylalanine sits upstream of L-Tyrosine, which in turn is involved in the synthesis of catecholamines including dopamine and norepinephrine.
Tyrosine has been researched in cognitively demanding and stressful conditions, though the evidence is not strong enough to treat it as a guaranteed fix for fatigue or motivation.[4]
Saffron is another interesting area. Randomised trials of the standardised Affron® extract have investigated mood and stress in adults experiencing low mood, including a 2017 trial using 28 mg/day for four weeks and a larger 2025 study using 28 mg/day for 12 weeks. Results have been promising in some measures, while not every outcome has shown a difference versus placebo.[5][6]
That nuance matters.
Ingredients can be relevant to a problem without turning a supplement into the answer to the problem.
Where Elevate fits
Elevate includes L-Tyrosine, L-Phenylalanine, DL-Phenylalanine and 30 mg Affron® alongside ingredients chosen for energy, focus and composure.
That formulation grew partly from an observation that feeling flat isn’t always fixed by becoming more stimulated.
But there are plenty of days where the better answer is a walk, food, sleep, a change of task or simply admitting you’ve done enough.
The useful question
Next time you think:
“I’m tired.”
try being more specific.
- Am I sleepy?
- Am I mentally saturated?
- Am I stressed?
- Am I bored?
- Am I unmotivated?
- Do I actually want to do this?
Those questions sound almost too basic.
But they’re a lot more useful than automatically reaching for the same solution every time.
Because sometimes you don’t need more energy.
You need to want to engage again.
Sources
- Boksem & Tops (2008). Mental fatigue: Costs and benefits.
- Salamone & Correa (2012). The mysterious motivational functions of mesolimbic dopamine.
- How to Tackle Mental Fatigue: A Systematic Review of Potential Countermeasures and Their Underlying Mechanisms (2022).
- Attipoe et al. (2015). Tyrosine for Mitigating Stress and Enhancing Performance in Healthy Adult Humans, a Rapid Evidence Assessment of the Literature.
- Affron® improves mood in healthy adults over four weeks: randomised, placebo-controlled trial (2017).
- An Examination into the Effects of a Saffron Extract (Affron) on Mood and General Wellbeing in Adults Experiencing Low Mood: A Randomized, Double-Blind, Placebo-Controlled Trial (2025).
