Fest-lag 

The vacant confusion and paranoia caused by a long stint at a summer festival: sleeping in the office bog, but buzzing at night; basically feeling like a fire alarm is going off in your cave when you're trying to hibernate.

I sat there staring at the log-in screen for an hour, three shaky fingers hovering above the keyboard, before I realised the extent of my fest-lag.

Fest-lag by nmnmnmnm July 16, 2010

Festlagged 

The state your teens are almost certainly going to be in when they return home after several days and nights without sleep at a music festival.

Mary is so festlagged from Reading she hasn't been out of bed since Tuesday.

Festlagged by Tyger's stepdad June 16, 2017