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.
1 Sloths typically beat out most cats in terms of sleep time, coming in at an impressively slothful 19 to 20 hours a day. 2  In the wild, female lions tend to sleep more than male lions. They need the extra rest because they do the hunting for the pride.  Cats are crepuscular, not nocturnal.