Alexander so esteemed his painter that he presented Campaspe to Apelles as a reward for the portrait. The tale of Alexander and Apelles, a favorite of Renaissance and Baroque painters, celebrates the power and nobility of painting. Giovanni Battista Tiepolo painted this episode at least three times.
However even 18 hours is not considered abnormal for a Chihuahua. This includes naps.There are 2 types of sleeping. One is a lighter sleep (called slow wave) and the other is the deeper sleep (known as REM-Rapid Eye Movement). Dogs, just like humans do have these 2 different types of sleep.
As others have mentioned there are many factors to keep into consideration and this includes age, breed, health status, temperament, household activity, and more. If you are looking for a ball point figure, most dogs on average sleep between 12 and 16 hours a day, while puppies may sleep 18 to 20 hours a day. Here are other factors to keep on mind: How much do dogs sleep on average?