But she was happy to see that her son, Master Sgt. Jim Sult, who is stationed at Yokota Air Base, had updated his Facebook page.
"HOLY CRAP!!!....did everyone feel that earthquake. Must have lasted about 1.5 minutes. Really Freaky and it's still going," he posted about 1:30 a.m. EST.
About an hour later he wrote, "OK just (an) update for my family and friends. We absolutely felt the earthquake and we are all doing fine."
Sult has lived in Japan for almost three years with his wife and teenage daughters.
In a Skype conversation, he told his mother he had just made it to bed before she called and woke him up.
He had worked a 16-hour shift when 11 commercial flights were diverted from Narita International Airport near Tokyo to Yokota to ensure safe landings.
Sult said he is stationed about 250 miles from where the earthquake originated, and the magnitude was about 5.0 in Yokota with plenty of aftershocks.
"TV said there have been about 30," he told his mom. "I’ve felt about five or six."
On his Facebook page he also mentioned how his dresser mirror kept falling as a result of the vibrations.