In my experience, turtles sleep mostly at night. I've raised and cared for Red Eared sliders, a Mississippi map, reeves turtle, Asian yellow pond turtle, and a few box turtles when I was a child. They all slept at night, although they all liked to sleep differently. For instance the map turtle ( still have) likes to sleep underwater on things that are centimeters from the waters surface. The turtles species and the individuals that I've encountered were nightsleepers.
Now an addendum to this! Turtles and Tortoises are very dyanamic creatures. They get their sleep when they need to. It seems somtimes that some of the calmer aquatic species like the Sliders and Asian pond Turtles can go into a trance while basking. I don't think a wild caught specimen would do this! Pretty much most aquatic turtles dart into the drink at the slightest suspition of danger. I this is some help.
they can sleep up to 15 hours
They sleep for about 2 1/2 hours to 3 1/2 hours!!
How many hours does it sleep
They either sleep on land or in the water.
well since sea turtles rarely sleep they really dont but if they do they will sleep on a nearby beach
daily
if you mean how many hours you should sleep in a year it would be 3,650 hours of sleep for a regular year not a leap year
about 10 hours of sleep
you must get atleast 9 hours of sleep
I sleep about 7 to 9 hours a day
they crawl into their shells and sleep
Its compulsary for a teen ager to sleep 8 hours..