Overnight News as Context Rather Than a Reason
Something happens overnight nearly every session. An announcement lands, a figure is published, a market elsewhere in the world moves sharply. The natural response is to work out what it means and then trade accordingly. That instinct is reasonable in most contexts and is quietly corrosive in this one, because a rule that triggers on price and a view that came from a headline will eventually disagree, and the headline usually wins the argument.
Two Different Jobs for the Same Information
News can be used to answer two questions. The first is which way price should go. The second is how contested the open is likely to be. These require completely different amounts of skill and offer completely different reliability.
Answering the first well means outpredicting a market full of participants who read the same story, have better information, and have already been trading on it for hours. Answering the second means noticing that something significant happened and expecting more disagreement than usual. The second question is answerable by anyone paying attention. The first mostly is not.
What Contested Actually Looks Like
An event that produces a clear, unambiguous revaluation tends to be absorbed quickly. Price moves to a new area before the bell and the regular session opens into relative agreement. The opening range that forms may be perfectly ordinary despite the dramatic headline.
An event whose implications are genuinely arguable produces something else. Participants disagree not about whether it matters but about how much, and that disagreement plays out through the open in the form of wide, fast, reversing movement. The range that forms in those conditions is taller than usual and its edges were set during confusion rather than through anything you could call a test.
Knowing which of these you are in is useful and does not require an opinion about the news itself. It requires noticing whether the premarket settled after the event or is still arguing.
How a View Contaminates a Rule
The damage from news-derived conviction is rarely a dramatic override. Nobody abandons their method outright. What happens is smaller and harder to catch.
A trader who believes the day should go up takes the upward break slightly early, because it looked like it was going to happen anyway. They give the same trade a little extra room when it goes against them, because the story is still intact. They skip the downward break, or hesitate long enough that the entry is no longer available. Every one of those adjustments is individually defensible and collectively they mean the rule is no longer being run.
The problem compounds afterwards. Results produced by a rule you partially followed cannot tell you whether the rule works, so the record stops being informative at exactly the point you most need it to be.
Scheduled Events Are a Special Case
A release landing at or very near the open deserves separate treatment, and here the useful response is procedural rather than analytical. Movement caused by a scheduled announcement is a repricing rather than an auction, and the extremes it produces are the boundaries of a spike, not levels anyone chose to defend.
A range built around that spike will be unusually tall and its edges will be unusually meaningless. Deciding in advance how you handle those sessions, whether by skipping, waiting for a later period, or reducing exposure, keeps the decision out of a moment when the chart is moving quickly and the temptation to participate is strongest.
The Note Worth Making
What survives from all of this is short. Note that an event occurred and roughly what kind it was. Note whether the premarket appears to have settled after it or is still moving. Note whether anything is scheduled for the first part of the session. Do not note which way you think it will go.
That last omission is the discipline, and it is harder than it sounds because having a view is more satisfying than having a description. The point of the preparation is to know what sort of session is likely, so that you can judge the range when it forms and can recognise conditions where the range will not be worth much. It is not to arrive with an answer that the session is then expected to confirm.