Why does a cat wag its tail when it slee

Why do cats wag their tails when they lie with their
eyes closed? This is a sign that they feel safe! Think
of this gesture as a pet's way of saying, "I feel safe
enough to keep my eyes closed." In general, tail
movement is an important part of feline body
language.
When a cat purrs What does it mean?
Experts say cats purr to communicate, to calm down,
or to heal from an injury or illness. If the cat is
comfortably in your lap and receiving attention and
affection, purring sounds will appear as a sign of
approval.
Why does a cat purr when petted?
Of course, cats often purr for the sake of
communication with a person, in order to show their
contentment, a sense of gratitude. They make such
sounds when they are caressed, treated to a delicious
treat, or when the owner returns home.