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.
Basically the male lions defend and protect their territory as females hunt. This is their part to keep their pride thriving and growing. Lions are affectionate and playful when resting, which can usually take up to 16 - 20 hours a day, and extremely defensive and nasty when food is on the scene.