Generally if we are being realistic here then day trading offers higher chances of profits than night trading, Not that night trading doesn’t offers profits but in day trading we stand the chances to make high profits than night trading.
In day trading there is always high liquidity because a lot of traders, investors, institution and big holders are live looking for positive means to make profits (that is the retail traders) while the big banks are looking for an inducement strategy to take advantages of the retail traders and liquidate them. so much chances of high profits if we know what we are doing but during night time there is always low liquidity because before 7pm almost 80% of traders have closed their positions because they focus much on New York session and London session while for night traders it the Asian session or Tokyo session.
However, one thing here is that day trader offers high chances of high profits but in that manner it comes with high risk because with just a mistake we can loss so especially when our risk management isn’t very effective but in night trading the risk are low.
Everyone have their own way of trading and the time they like to trade, i think the reason he was ask how much he love to sleep is because trading is not for lazy people that sleep around, you can make profit at any time as trader, you can like a day trader because that is your lucky time, and there are people that prefer a night trading because they see it as their lucky time, you can make a profit at any time, maybe his friend loves night trading and wants him to be trading with him in the same time that is why he said that.
When it comes to trading you have to make it clear to anyone that is interested in trading, because it is very risky than investing in bitcoin, you can lost your money in a day or in a single night without gaining any profit, i don’t blame the way the person ask him but he should ask him if he is ready to take the risk.