Bitcoin prices can still jump when US and European markets are closed. This usually does not happen because someone is "dumping on purpose." It happens because liquidity dries up, and even a small order can push the price too far in the order book.
Why price jumps happen more often when markets are closed
When traditional financial markets are closed, major institutional trading desks, market makers, and hedge funds are less active. Bitcoin spot trades 24/7, but its liquidity depends heavily on these institutions. When US and European institutions are away, the order book becomes thin and the gaps between buy and sell orders widen. At this time, a relatively small market order or liquidation order can eat through several price levels at once, causing a sudden price move that shows up as a "spike" or "wick" on the chart.
To understand this more clearly, compare liquidity with price jump size. When liquidity is high, a $5 million order may move the price by only 0.1%. But when liquidity is thin, the same order can move the price by 0.5% or more. The price itself has not become more jumpy; the "cushion" that absorbs these moves has become thinner.
Common triggers for sudden price jumps
During US and European off-hours, price jumps usually come from a few sources. One is liquidation chain reactions: a slow price drop triggers some stop-loss orders, which then trigger more forced liquidations and create a brief chain reaction. Another is institutional activity in Asia or Australia. Even when Western markets are closed, large traders and market makers in Asia are still active, and their buying, selling, or canceling orders can affect price more easily when the order book is thin. A third is delayed digestion of news. Some macro data or industry news released during US or European trading hours may be ignored at first, then repriced by some participants during lower-liquidity hours.
How these jumps affect traders
These price jumps are often "fast" and "fake": the price may jump 1%–2% within a few minutes, then quickly return to its previous range. For traders holding positions, the real danger is that the spike can trigger stop-loss orders. After the price pulls back, you may find your position was closed even though the price went back in the original direction.
What to do next
If you hold a position during US and European off-hours, consider widening your stop-loss distance a bit, for example to 3%–5%, so a short-term low-liquidity price spike does not knock you out of the market. Also, use price alerts instead of watching the market constantly, and avoid emotional decisions during very low-liquidity periods.
