Hi Linah, there was a time when people used to trade during the day. However, in 1999 The Securities and Exchange Commission legalized the process of trading at night. Since then, the idea of buying or selling stocks and other contracts during the day started to feel positively quaint. Night trading is the process of buying or selling stocks and other contacts after the stock exchange closes or before the stock exchange opens. You should note that some stock exchanges like the New York Stock Exchange (NYSE) and Nasdaq only operates during the normal daily hours (from 9:30 am and 4:00 pm). You should also note that the best time to trade is when the market is active. And not all hours during the day, the market is active. Therefore, some people decide to trade for some hours during the day and some hours during the night. Trading is like freelancing. You can trade when you want as long as you can concentrate on executing the trades.