Difference between Stretch oneself and Stretch oneself out

stretch oneself—straighten the body and extend the arms, especially when a person yawns:

• The Jamaican stood up and stretched himself. “Glad you woke me, man,” he said.

stretch oneself out—extend one’s legs and body in a straight line while lying:

• The room was enveloped in darkness. Kedar stretched himself out on the bed without turning on the light.