"If this trades doesn't go as planned, will I still be able to sleep at night?"
Spot market traders will never mind this kind of scenario. When you have second chance of holding, you will feel more comfort still all you need is, waiting for a dip to grab. No one could accurately spot a perfect dip, you must second chance. Trading is all about uncertainties hence performing with only one option, how would get you better results? You must have plan b always. This way, derivative markets or sport markets with leverage are never recommended.
when a trader opened position and earn money easily at night and open another position, thinking it will also be easy
Happened to me. The lesson I learned is, never trade in excitements because all signal will look positive. Emotional balance must be a re-requisite for trading, breaching this basics, will lead to a new lesson for sure.