Is staying up all night and day unhealthy?

i went on the computer about 3am and before i knew it, it was 8am, and if i goto sleep now ill get up at like 6pm or 7pm, so i dnt really wna goto sleep as i have a party 2nite and hvae to get ready at 3pm...isit ok to stay up all night and day as a one off? it cant be too bad can it??