Sorry to revive a dead thread, but I just came across this article
that talks about a sailor that took his sails down at night to get sleep while crossing the Atlantic. Took him longer that way, not surprisingly, but he was apparently well rested. As I remember, the skipper of Tinkerbelle
did pretty much the same thing when he wanted to rest. I have also sailed with a gentleman who had previously sailed solo across the Atlantic, during which trip he simply slept all night until he got a premonition that he was near land, and then made landfall the next day.