Day or night, you must answer this question before you begin trading. Consider the trading day's path and you'll understand why this topic seems irrelevant.
Getting ready to open in Asia.
Next up, is the Middle East.
Then London and Europe.
Finally, we have New York City and the United States of America.
Not all these trading areas will be open at any given moment or in the same location. Even if you're a night trader in the US and the Middle East and Europe are closed, you'll be limited to the US and Asia. The currency markets you have access to will depend on what time of day you trade.

The best time of day to buy and sell in forex trading depends on your strategy and the currency pairs you're trading. Typically, the most active trading periods are during market overlaps, such as the London-New York overlap (8 AM to 12 PM EST). These hours see higher volatility and liquidity, ideal for day traders looking to capitalize on price movements.

For longer-term traders, time may be less critical, focusing instead on market trends and fundamentals. However, avoiding low-liquidity periods like the late Asian session can help reduce the risks of erratic price movements.

Your choice should align with your trading goals, the currency pair's behaviour, and your schedule. Planning around market activity can enhance decision-making and profitability.