[MargaretR]

When I had the job of visiting and interviewing newly separated women, I often spent mornings listening to stories of brutality, and afternoons putting it down on paper.
One day on return to the office I decided I needed to unwind by using yoga relaxation.
The other visitors hadn't got back yet, so I laid down between desks, stretched out, on my back with my eyes closed.
I nodded off and was wakened by a shriek.
So I don't recommend 'sleeping on the job'