Falling unconscious during sleeping

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I don't know exactly how to describe this but I will try best to describe it. Sometimes when I sleep, I had some sort of bad dream but after it finishes it's quite hard for me to wake up. I feel like falling into unconsciousness and I try really hard to make myself conscious and wake up. When I failed for the first two or three then I pushed myself really hard until I manage to open my eyes and wake up. I don't experience it everyday but it was really weird for me. Have anyone of you had the same experience as I did? Please share the story.