I can’t answer that from a scientific standpoint, but I will say that they know which side their bread is buttered when it comes to doss down for the night. Below is the front room view from a typical turtle home.
You see even though they make their migrations to lay eggs, turtles seem to like to hang around comfortable spots where the fishing is good and the threat of tiger sharks is low.
I spotted this family of turtles having a sleep in the early evening after a hard day’s swimming about in high seas. Despite their formidable underwater ability, turtles need to breathe fresh air like the rest of us, and since they’re not fish, they get tired of swimming all the time too.
The first time I saw this lot, I almost tripped over one of them, thinking it was a rock. They sleep just where the water laps them and let the sand bury their flippers and the edge of their shells, giving them a rocklike appearance.
Although they don’t seem to mind people getting a little close, it’s best not to disturb them as they will wake up and slide off into the sea, which can’t be pleasant after being disturbed from a peaceful rest.