If you are tired during the day - take a nap IN YOUR CAR at lunch hour. Set your cell phone to wake you up! No one will know you are there, you can put one of those sunshades on the windshield and sit in the back with your legs up. It saved me many times when I was working in offices!
In Texas it is a crime, believe it or not, even if on your own property! NO ONE can sleep in their car, even for a short time. Several people I know, one a relative, have been ticketed for it! Solution, buy 4
Sun Visors for all four sides and park within a private underground or overhead parking garage. It might buy some time and will certainly discourage anyone reporting it. The law seems to be an over-reaction to prevent loitering, and "suspicious activity", especially since so many innocent folks nap off and on while waiting on someone in a store, for example. I don't believe this law has been lifted over the last ten years here.
Hopefully it's not a law in your state? God bless and help you rest. : )
