When i was younger i remember once i went to bed and i was so happy that i laughed myself to sleep.
If you don't sleep you get run down. Sloths never get a flu, cos its good innit thats when your body's replemishing.
The reason I did the book about holidays is that you're a different person on holiday. You're sleeping somewhere unfamiliar, knocking about with people you've never met and for 10 days you're someone else. You're out of your comfortable zone.