What is the best time to trade USDJPY in Nigeria?

USD/JPY sees its peak activity during the New York session which starts around 2:00 PM and ends around 11:00 PM Nigerian time.

If you miss trading during this period, you can also trade USD/JPY during the Asian session but you have to stay awake during the wee hours of 1:00 AM to 5:00 AM Nigerian time.

For someone in Nigeria, when you trade USD/JPY at the above suggested times, you will notice the spread will be lower than what it would have been had you traded outside these times.

The New York session is the best time to trade the USD/JPY forex pair because most big American banks are open at this time which translates to lower spreads and faster execution. Catch the New York session between the hours of 2 pm and 11 pm if you are trading from Nigeria.

You can trade usd/jpy during the New York or Asian session but trading during the Asian session will mean trading at odd hours when you should be sleeping so I would say the New York session is more convenient since it starts by 2:00pm in the afternoon till 11:00pm Nigerian time.

London session (I know you thought I would say Asian session)

I agree with you, the London/Frankfurt session has potential for liquidity and less sudden spikes when trading USD/JPY.

Nigerians can trade USD/JPY from the Frankfurt session open (7 am) till the New York session close (9 pm) on weekdays. However, what works for me is I get into the market from 7 am Frankfurt session, and try to catch the direction of the market early while setting a small stop loss.