a) had slept This is the most natural. Your choice could be correct in an extended context.
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enoonNah. You don't choose how to sleep, so the progressive sounds funny.Along the same line, although grammatically acceptable, I don't ever remember anyone saying " I sleep badly last night...". It is just not idimoatic in my opinion.
grammarfreakAlong the same line, although grammatically acceptable, I don't ever remember anyone saying " I sleep badly last night...". It is just not idimoatic in my opinion."Along the same lines, although it might be grammatically acceptable, I don't ever remember anyone saying
grammarfreakI should have my thinking cap on...my carelessness!Most of us are guilty of leaving the thinking cap off from time to time.