In Only YPR Counter,you're allowed to sleep from last night 8 pm itself,so chances re more,if u can carry ur own lota-kambal-chaddar & some TOI Newspaper sheets,put some Odomos Mosquito Repellant Cream & have a sound sleep from 9 pm to next morning 4 am.Also 1/2 street dogs may accompany you & give you warmth from their exhale right next to ur face.& If u're a pet lover,then I dont think that it'll be problem for you.Best of Luck :)Summer Rush,getting CNF Tatkal Ticket from any source is a big challenge.