He Wasn’t Getting Enough Sleep
They also worried that Jack would get sick and tired if he continued to stay awake all night. He didn’t get enough sleep during the day, either. Eventually, they decided to install hidden cameras in the bedroom to see what Jack was up to. The tapes showed him standing at the door and watching them sleep the whole night. He managed to fall asleep for a few minutes but then woke up and watched them sleep until the morning.