Timothy Eagan wrote: "Trump gets by on barely half the amount of sleep recommended for a healthy life....three or four hours, and sometimes just 90 minutes."
The Times say sleep deprivation makes people "cranky and temperamental," "impulsive," and "smaller things set them off."
The newspaper suggests that may account for his outbursts on the campaign trail where the GOP front runner said he wanted to punch a protester and told a venue to keep the lights off as he was speaking.
See Trump's most controversial tweets:
Craziest Donald Trump Tweets
Is Donald Trump's bizarre behavior caused by sleep deprivation?
I told you @TIME Magazine would never pick me as person of the year despite being the big favorite They picked person who is ruining Germany
I would like to wish everyone, including all haters and losers (of which, sadly, there are many) a truly happy and enjoyable Memorial Day!
Just made the point at #NCGOPcon that "we have to protect our border & I think everyone here knows, nobody can build a wall like Trump!"
My twitter has become so powerful that I can actually make my enemies tell the truth.
China's Communist Party has now publicly praised Obama's reelection. They have never had it so good. Will own America soon.
While Jon Stewart is a joke, not very bright and totally overrated, some losers and haters will miss him & his dumb clown humor. Too bad!
Why is Obama playing basketball today? That is why our country is in trouble!
An 'extremely credible source' has called my office and told me that @BarackObama's birth certificate is a fraud.
Remember, I said Derek don't sell your Trump World Tower apartment...its been lucky for you. The day after he sold it, he broke his foot.
I never fall for scams. I am the only person who immediately walked out of my ‘Ali G’ interview
.@cher--I don’t wear a “rug”—it’s mine. And I promise not to talk about your massive plastic surgeries that didn’t work.
The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive.
.@katyperry is no bargain but I don't like John Mayer--he dates and tells--be careful Katy (just watch!).
.@BetteMidler talks about my hair but I'm not allowed to talk about her ugly face or body --- so I won't. Is this a double standard?
It's Thursday. How much money did Barack Obama waste today on crony green energy projects?
Truly weird Senator Rand Paul of Kentucky reminds me of a spoiled brat without a properly functioning brain. He was terrible at DEBATE!
Hey @realDonaldTrump - In case you're looking for that tweet you deleted .. I got it right here. http://t.co/a6F98q5xGU
This very expensive GLOBAL WARMING bullshit has got to stop. Our planet is freezing, record low temps,and our GW scientists are stuck in ice
Everyone knows I am right that Robert Pattinson should dump Kristen Stewart. In a couple of years, he will thank me. Be smart, Robert.
26,000 unreported sexual assults in the military-only 238 convictions. What did these geniuses expect when they put men & women together?
Sorry losers and haters, but my I.Q. is one of the highest -and you all know it! Please don't feel so stupid or insecure,it's not your fault
How amazing, the State Health Director who verified copies of Obama’s “birth certificate” died in plane crash today. All others lived
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Sleep deprivation expert Dr. Steven Feinsilver says lack of sleep may also explain some of Trump's fits and disposition.
"Sleep deprivation has effects on both physical well being and mental well being and actually emotional well being," he told IE. "We are all designed to get at least seven-and-a-quarter hours of sleep. If you get less than that, it is associated with making a lot of errors."
The latest controversy is Trump's failure to immediately disavow the support of white supremacist David Duke and the KKK.
He was asked about the endorsement on CNN's State of the Union and blamed a bad earpiece on his failure to answer the question.
On Monday, Trump told the Today show: "I was sitting in a house in Florida, with a bad earpiece. I could hardly hear what he's saying. I hear various groups. I don't mind disavowing anyone. I disavowed Duke the day before at a major conference."