Some believe that Stonehenge (2500 BCE) in England was built to help establish when the Summer Solstice occurred.
Males and Females sleep up to 18-20 hours a day in most cases. Depending on how hot or if the weather is perfect than the lion will sleep. If the weather is good ther will sleep about 14-18 hours and go hunting or playing.
Though rat sleep hours vary, a typical rat sleeps for 20 hours out of 24 (in captivity). A dog sleeps 12-14 hours per day; a lion 13-20 hours; a chimpmunk 15; an elephant 3; a deer also 3. As you can see, interspecies sleep pattern comparisons make little sense.