I did 17 years working nights, and later on/off another 8 years and learned how to trade during the day. Most likely you have a day job. It will be difficult for you to go to sleep when you come home from day job and sleep evening, seal off your bedroom from outside lights, don't use computer or anything electronics for hour before and no exercise as this will make it much tougher to fall asleep. Do exercise during trading, put screen in front of equipment you will need to buy, you actually get in very good shape waiting for trades, don't drink coffee as your body just gets use to it and when time for bed it seemed to kick in when I needed sleep. Everyone is different in number of hours of sleep needed, so teas are better during trading, I would drink coffee before trading. As far as long term health, going against natural rhythm of the sun, tough to say, I been ill ten years with various auto immune diseases and cancer but others I know in perfect health. I most likely took on extra stresses between working nights and another fun profession working odd hours but less exercise done and eating more red meats, so keep in better shape and eat right, should be fine and get yearly physicals.
Good luck.