Sleep is important no matter if you're playing poker or not, I wish I was not a idiot when I was younger, I used to stay up till all hours playing video games then go to bed at like 7am. I have issues now like only getting 4/5 hours sleep and sometimes if I'm lucky a good 7 hours. Sleep is good for your mental health and also your heart, if you want to live to old age look after your heart!