Based on the context and the answer, generate a question. 

Context: I ca n't update my blog the normal way at the minute ... so I ' m trying this . It 's the " email " feature LJ has . I 'm in the van , it 's the middle of the night , and I got up to pee andcouldn't fall back asleep . I ' m near Rapid City South Dakota , and it'sbeautiful here . I went SWIMMING last night ! I never swim ! ! !

Answer:

None of the above choices .



Why ca n't I fall back asleep ?