Superman with his super-Kryptonian physiology probably doesn't need much sleep. He gets energy from the sun and probably just sleeps out of habit. He can clearly skip out on a few nights sleep if he's fighting a major super-villain situation.
Other heroes actually have day jobs. They're not all billionaires and need a source of income. We've seen Spider-Man crash while trying to juggle his day job (before he was blacklisted as a photographer) along with his criminal-busting activities. Dick Grayson, back when he was a police officer, worked his beat in Blüdhaven during the day and took to the night as Nightwing afterwards.
The heroes may have superpowers and super physiology, but is this lack of sleep healthy? If they've dedicated themselves to fighting crime and protecting the innocent, who's looking out when they decide to take a nap?
== TEASER ==
If heroes do take the time to get a good amount of sleep, can they truly rest knowing that while they're lying there, crimes are being committed and innocents are being threatened? It could come down to how dedicated and focused are they in vanquishing evil. It would help if they developed some sort of schedule with other heroes with shifts to cover different hot spots for crime. I don't really recall seeing Batman ask someone to cover his shift while he catches some z's. Spider-Man often worked alone and didn't have anyone he could ask to take his place.
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