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.
To see a lion in its natural habitat is one of the main attractions of going on safari in Africa. You're more likely to see one snoozing than in active pursuit of dinner since they tend to rest for about 20 hours a day.