I have read an interview of a very successful scalper turned daytrader in US markets. He being successful daytrader he used to get invitation to lots of traders and hedge funds late night parties. But he had a rule that he will not drink if he has to trade the next day and he will not stay awake late at night...
But he could not totally avoid these parties else he will be considered as wise man not mixing type..so he used to go there, have a drink served to him and then go around and chit chat with his trader friends making sure he chit chats with every one...by 9:30 or 10:00 he will throw the drink in the wash basin and go home, have simple food at home and sleep ...while the trader party continues till midnight with traders talking their millions made or lost, their frustrations etc
Next day he will get up at 5:30 does his excercise , has a look at the charts and he is fully alert for trading when his other daytrader friends are having hangover, headache, bad stomach, drowsiness while trading....some sleeping till late hours....the whole day is spoilt for these guys.
That is the kind of commitment one needs to his profession.
ST