I don't know what's got into me

• I don't know what's got into me: どうかしてた

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• I should have started studying a month ago, I don't know what's got into me...
  （ほんとなら1ヵ月前には勉強を始めてなくちゃいけなかったのに、わたしどうかしてたわ）
  J. K. Rawling, Harry Potter and the Philosopher's Stone, Bloomsbury, p. 167