"They may show extremes in behaviors. they (may) sleep too much or have difficulty sleeping", says Aten, who is not involved in the boys' treatment.
On Sunday, teams of divers brought out four of the trapped boys but waited several hours before confirming their safe rescue.
CHIANG RAI, Thailand-A mission to rescue a group of boys and their soccer coach trapped in a flooded cave in Thailand resumed on Monday, the chief of the mission said, after the first four boys rescued were judged healthy as they recovered in hospital.
The head of the rescue mission, Narongsak Osottanakorn, said last week they would bring the fittest people in the group out first.
The operation paused Sunday evening so that rescue teams could refresh the supply of air tanks that have been placed along the escape route inside the cave, Narongsak said.
An Australian doctor is at the center of the ongoing attempt to rescue the young soccer players and their coach trapped in the Tham Luang cave in Thailand's northern Chiang Rai Province. Authorities have said extracting the entire team from the cave could take up to four days, but Sunday's success raised hopes that it could be done faster.
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Four of the boys were safely rescued on Sunday after rescuers carried out a risky operation, amid fears the waters will rise again to a unsafe level. Officials have said storms forecast for Chiang Rai province in Thailand's far north had factored into their decision to go ahead with a complicated and risky plan to have the boys and their coach dive out of the cave.
Thailand's health secretary, Dr Jessada Chokedamrongsook, said the group would undergo a series of tests while quarantined in hospital.
Upon exiting the cave, they were evacuated by helicopter and ambulance to hospital in Chiang Rai province, where they remain.
Four more members of a youth soccer team were pulled from a flooded cave in a second round of rescue operations in Thailand on Monday.
A source involved in the rescue mission who saw two of the four boys walk out of the cave told Reuters that they looked exhausted but healthy, adding that one even looked "vivacious and fresh".
A search and rescue operation was mounted soon after they were reported missing, and military divers have since rescued five of the boys. Rescuers sought to take out the boys in the weakest condition first. A retired Thai Navy SEAL assisting with the operation died Friday after running out of oxygen, underlining the danger of the rescue.
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Dozens of foreign divers and other experts from around the world were brought in to help the rescue effort, working alongside the Thai Navy SEALs.
"I'm hoping for good news", he said.
"Imagine marathon runners. It's like when they reach the finish line exhausted", said the source.
A total of eight of the 12 boys have now been brought out of the treacherous cave system by divers, including four who were brought out on Sunday, when the rescue operation began.
"But if the rain god doesn't help, then it could be challenging". Four were rescued Sunday and four more on Monday.
"The fact that it took so many hours underscores how precarious this whole mission is", she said.
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Relatives said the boys had been inside the labyrinthine complex during the dry season.