I do know you don't want to be laying in the sun covered on a hot sunny day. Heck I get burn just working on equipment on my asphalt pavement. The other day it hit 145F according to my temperature gauge. That is a medium rare steak temp.
The grass came back nice and green in a couple of weeks. But, the grass is now mad at me and it lets clover and dandelion grow in it as a punishment for what I did.