I am sure he will have some people monitoring him. Most people die playing games for a long period of time because they are idiots and dont eat, drink, or sleep. People have stayed up for upwards of 11 days I believe. I think there is a very small chance he actually dies from 4 and a half days.
Sleep deprivation alone won't kill you unless you have very rare genetic condition (which will kill you once triggered because you literally can't sleep after that). It's impossible to stay awake long enough for it to kill you for a normal person.