The First Session After a Short Night

Two mornings can look identical on the chart and be completely different sessions, because the difference is sitting in the chair rather than on the screen. Five hours of sleep does not make anyone obviously incapable. It removes the last fraction of reaction time and most of the tolerance for waiting, and both matter more in the first hour than anywhere else in the day. The version of the routine described at orb trading routine richiebranson is deliberately shorter on these mornings than on a normal one, since a shortened list gets finished and a full one gets abandoned halfway.
What Actually Degrades

Reading a chart is barely affected. Judgement about whether a level has held is barely affected. What degrades is the gap between deciding and acting, and the willingness to sit through a retest without touching anything. Tired traders enter early and exit early, and both errors are invisible in the moment because each one felt like decisiveness.
Change the Session, Not the Effort

Concentrating harder is not a lever. The levers that exist are size, count and window. Halving the position size makes every subsequent decision cheaper. Capping the day at one trade removes the second entry, which is where most of the damage on these mornings lands. Ending at the close of the first hour rather than trading through to the power hour removes the part of the day that needs the most patience.
The Pre Open Pass Gets Shorter, Not Skipped
Skipping preparation on a tired morning is the exact wrong direction, because a tired session needs more structure and less discretion. The compression happens in the optional half. Marking the previous day high and previous day low, checking the calendar and setting the alert at the range boundary all stay. Scanning fifty names does not.
Premarket reading in particular gets cut. It is the part of the pass most likely to generate a new idea, and a new idea on four hours of sleep is a liability.
The Honest Option Is Not Trading
One session missed costs a fraction of one bad session taken. The arithmetic is not close, and it is worth working out once so the decision is not relitigated at 9:15 every time. Missing a day removes an expectation of profit. Taking a bad day removes capital and adds an entry to the log that will distort the next review.
What to Record
Sleep is worth one field in the trade journal, entered as a number rather than a description. After thirty sessions it either separates the results or it does not, and either answer is useful. Most traders assume it matters and never check, which leaves a rule running on faith. A field costs nothing and turns the assumption into a sample size.