Ayako felt dizzy last night, what happened to her?

  Last night, after going to bed, Ayako felt dizzy and sick in bed. She measured blood pressure, and it was 155, which was not abnormal. Then she measured blood sugar level, which was normal. What was the cause of her sickness? Anyway, she seemed  to have got better soon, and seemed to have fallen asleep. This morning, when she woke up, she was all right.
  I drove her to the hospital, not to see the doctor, but to run some other errand. On the way back, we bought lunch at Sakuragi Coop.
  It was a cold windy day, so I stayed at home all afternoon and evening.