UPDATE: 10:45 p.m. EDT — In an interview with CNN Monday night, Hillary Clinton said she didn't think her pneumonia “was going to be that big a deal.”

“I was supposed to rest five days — that's what they told me on Friday — and I didn't follow that very wise advice,” Clinton said.

Original story:

Former President Bill Clinton said Monday this isn’t the first time his wife has suffered severe dehydration.

Democratic presidential nominee Hillary Clinton was forced to leave a Sept. 11 commemoration ceremony Sunday in New York and seemed to stumble as she got into her van after complaining of being overheated. It was later revealed she had become dehydrated and was suffering from pneumonia.

In an interview on PBS that also will be aired Tuesday on “CBS This Morning,” Bill Clinton said his wife often works “like a demon” and neglects to keep herself hydrated.

“She’s doing fine, she was even better last night before she went to sleep. She had a good night’s sleep she’s doing fine,” he said.

“On more than one occasion, over the last many, many years, the same sort of thing happened to her when she got severely dehydrated.”

Hillary Clinton took the day off from campaigning Monday to rest. She was expected to rest Tuesday as well. Several members of her staff also have reported illnesses in recent weeks.

Her rival, Republican presidential nominee Donald Trump was unexpectedly quiet about Sunday’s incident despite weeks of raising questions about her health.

“I hope she gets well soon. I don't know what's going on. I'm like you. I just see what I see -- the coughing fit was a week ago, so I assume that was pneumonia also,” Trump said on Fox News. “So something is going on, but I just hope she gets well and gets back on the trail, and we'll be seeing her at the debate.”

Clinton spokesman Brian Fallon told MSNBC the campaign would release more medical information in the coming week. Fallon said though she was diagnosed with pneumonia Friday, she was determined to attend Sunday’s ceremony.

“It is our intention in the next couple of days we will be releasing additional medical information about Hillary Clinton,” Fallon said.

Trump said he will release results of his medical records Thursday on “The Dr. Oz Show.”

Neither candidate has yet released any detailed medical information although both have released letters from their doctors. Clinton, 68, takes blood thinners and has a thyroid condition. Trump, 70, has said only he is in excellent health.