Every trading book has a chapter on psychology and every one of them ends the same way: control your emotions, trade your plan, do not revenge trade. True, and useless, because none of it is measurable. You cannot improve a feeling. You can improve a number, and the trader's state is a number if you ask for it the way psychologists do.
This article shows how: which questions are worth asking, why they are so few, what the research on traders actually found, and what the four charts look like when you read your own state against your own trades.
What the research says about traders and emotion
The best-known study followed 80 day-traders for five weeks with a daily emotional-state survey and matched the answers to each trader's daily P&L (Lo, Repin and Steenbarger, American Economic Review, 2005). The finding was not "calm traders win". It was sharper: traders whose emotional reactions to gains and losses were more intense performed significantly worse, and large, sudden swings in state were the most expensive of all. Personality traits predicted nothing. The swing did.
A second study interviewed 118 professional traders about how they handle emotion (Fenton-O'Creevy and colleagues, 2011). The better performers did not suppress feelings; they managed them before the decision: choosing when to trade, reframing a loss, writing things down. Suppression during the trade was the losing strategy.
Then there is tilt, the poker word for the state after a bad beat in which you stop playing your game. It has its own validated scale (the Online Poker Tilt Scale) and it gets worse on short sleep. The evidence on sleep and risk-taking is mixed in laboratory tasks, which is exactly why you should measure it in your own data rather than trust a rule of thumb.
Put together: the state that matters is not a mood label. It is how far you have swung from your baseline, and whether you entered the trade calm or tilted.
Why five questions are enough
Psychologists who sample mood many times a day do not hand out twenty-item questionnaires. They use one or two bipolar items per dimension, because decades of ambulatory assessment show that a single well-worded item is sensitive and reliable enough when it is asked repeatedly. The standard dimensions come from the Multidimensional Mood Questionnaire: good–bad (mood), awake–tired (energy) and calm–nervous (calmness). Sleep quality has its own single-item scale, validated against the long Pittsburgh questionnaire. Fatigue and stress have single-item versions too.
So the complete instrument is:
| When | Question | Scale |
|---|---|---|
| Before the session | How did you sleep? | 1 poor · 5 great |
| Before the session | How is your energy? | 1 drained · 5 fresh |
| Before the session | How is your mood? | 1 bad · 5 good |
| As you open a trade | How calm are you? | 1 tilted · 5 calm |
| After the session | How is your mood now? | 1 bad · 5 good |
Five taps, two of which you will often skip. The morning three are what predict the day, because they are answered before the P&L exists. The entry question catches the thing a daily number cannot: the second trade after a loss. The evening mood exists for one reason, the swing: evening minus morning is the cheapest proxy for the "intense reaction" that the 2005 study priced.
Reading your state against your trades
Once the numbers exist, four questions become answerable from your own journal.
Which emotion makes money? Group trades by the label you gave them (calm, focused, excited, tired, anxious, angry, FOMO) and look at net and win rate per label. Most traders find two or three labels that never make money. That list is your "do not trade" list, and it is personal; nobody else's applies.
What does a short night do? Band your days by morning sleep (1–2, 3, 4–5) and compare trades per day, net per day and the share of trades that carried a mistake tag. The number that matters is usually not net; it is the mistake share. In the demo account, trades opened on days rated 1–2 for sleep carried a mistake tag 78% of the time; on days rated 4–5, 6%.
Do tilted entries cost more? For each state at entry from 1 to 5, the share of trades with a mistake tag. If the bar for 1–2 is tall and the bar for 4–5 is short, you have found the lever: not "be disciplined", but "do not click when you would rate yourself below 3".
How does my mood move with my money? Your chosen measure drawn day by day on a 1–5 scale, with daily P&L beneath it on the same dates. This is where the swing becomes visible, and where a losing week that started with three short nights looks different from one that started calm.
Two warnings belong next to every one of these charts. First, small samples: ten rated days say little; forty start to mean something. Second, direction: a bad day lowers the evening mood as surely as a low morning mood makes a bad day. That is why the morning questions carry the weight. They were answered before the market had a say.
How to do it in SetupBook
SetupBook asks exactly the five questions above and nothing else. The morning three sit on the dashboard's Today card and save as you tap, no button, no reminder, nothing required. The state at entry is one tap on step one of the trade form, where you log the trade as you open it. The evening mood lives in the journal next to your end-of-day review. The four charts above are the Psychology block of the Analytics page, with the same period selector as everything else, a grey n badge under five samples, and a "How these are measured" note that links to the full method with sources.
It costs nothing and asks for no card. The user guide walks through the charts with the demo account, which has six months of rated days, including the July that made the demo trader start a journal. If you want to know what you trade like on four hours of sleep, create a free account and tap three squares tomorrow morning. The chart will tell you in a month.
For the other half of the picture, the cost of each mistake in money, read what your trading mistakes cost.