Question: Do you feel sleepy when you are sitting down?
Analysis

1.You can answer based on your personal experience of whether sitting down makes you feel sleepy. 2.You can also explain the circumstances under which you feel sleepy when sitting, such as after a meal, during a long meeting, etc.

Synonyms
Try these synonyms instead of repeating the question:
  1. feel→experience; sense
  2. sleepy→drowsy; tired
  3. sitting down→seated; resting