I have found another "siesta" painting by John Sargent - a watercolour of gondoliers in Venice.

Gondoliers

'Gondoliers' Siesta' 1905
John Singer Sargent

"John Singer Sargent painted watercolors most of his life, but until about 1900 he did so only fitfully and, as he said, to "make the best of an emergency."

By about 1900 Sargent had tired of formal portraiture. "No more paughtraits," he wrote his friend Ralph Curtis. "I abhor and abjure them and hope never to do another especially of the Upper Classes."

In depicting figures, 'Gondoliers' Siesta' is something of a rarity among Sargent's later Venetian watercolors.

And instead of the clear blue skies and vibrantly coruscating light of most of Sargent's Venetian watercolors, 'Gondoliers' Siesta' is, with its overcast sky, more subdued, more languid, shadowy, and even mysterious.'

( From: http://www.nga.gov/exhibitions/horo_041.shtm )