Back when I was broadcasting music festivals ... my favourite place to nap was suspended in a hammock under the stage. I usually arrived in the wee hours of the morning, set everything up ... then I had down time during the shows. Hearing protection on, swinging gently under the stage with a rythmic thumping - zzzzZZZZ. Once the show was over, I had to rip everything out - so there was no sense going home in between.
Sleeping with a bass vibrating close to you, not bad not bad!