If you mean, "I was sleeping, when suddenly I awoke", then it is
나는 잠자고있는 동안 갑자기 깨어났다.
This sentence can be rendered in many different ways, so this would not be a unique translation to what you want to say.
24 november 2017
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!