So for me in this situation you can buy your Bitcoin at day time and trade it at night when it adds
But it is very important to watch at it carefully.
Day time for you probably night time in other side of world, so this suggestion isn't going to work imo.
The best time to buy Bitcoin is just whenever your heart desires and it just depends on what type of trade do you want, is it short-term trade or long-term trade? And how much time do you willing to put to actually look at the price at anytime to ensure the best result and sell whenever you feel like it. There would be in the future that the price would have a new resistance point so you would get the profit if you are patience enough.