It was an accidental nap , but the episode of CSI that was on is one I ' ve seen and it did n't keep my interest . So I napped for about 3 hours . I did n't feel the frantic " Ca n't sleep because I 'll be missing something " . Instead I just felt relaxed and comfortable . After nap it was just about evening so I gussied up and sallied forth to see and enjoy .

Choices:
-- I was feeling sleepy and felt I would have an accident ..
-- I was driving and fell asleep while driving ..
-- The nap was unplanned but I was tired ..
-- None of the above choices ..
Answer the following question: What is meant by " accidental nap " ?
The nap was unplanned but I was tired .