Traders who focus on the London open sometimes ignore what happens after 16:00 GMT. That final hour before the New York equity close — and the quieter period that follows — often sets the boundaries that Asian session traders react to overnight. Understanding this handoff improves your pre-London preparation even if you never trade the afternoon.
Participation drops before the equity close
Between 16:30 and 17:00 GMT, US equity markets close and macro desk participation thins. On EUR/USD, five-minute candle ranges often contract sharply compared to the 13:30–15:00 overlap window. Moves during this contraction phase tend to mean less for the following day's London open unless they settle at a clearly defined level — a session high or low that holds into 20:00.
Levels that survive the handoff
Not every afternoon level matters overnight. The ones that do share a trait: price tests them at least twice between 16:00 and 20:00 with decreasing range on each test. A level touched once during a spike and abandoned rarely influences the Asian session. A level defended twice with contracting candles often becomes one boundary of the overnight range.
When you mark your Asian range the next morning, compare its high and low to levels from the previous afternoon. Overlap is common. Recognising that continuity helps you understand whether overnight price action is exploring new territory or still auctioning yesterday's value area.
Asian open behaviour relative to New York close
Tokyo opens at 00:00 GMT. The first hour of Asian participation frequently reacts to the level where New York left price — not where London closed twelve hours earlier. If New York settled near its session high, Asian traders may probe higher overnight. If New York faded into its close, Asian range formation often begins with a drift toward that fade level.
Why this matters for London traders
You do not need to trade the afternoon to benefit from observing it. Spend five minutes after 17:00 noting where price settled and whether any level was defended twice. Add that level to your next morning's chart alongside the Asian range. Participants in our Volatility Observation Clinic often bring afternoon charts that explain confusing overnight gaps — the context was visible the previous evening.
For session times and a full GMT timetable, see our Session Guide.