Complete this phrase small as a mouse, big as a

I'm a professional sleeper with a very specific schedule. I’m the first thing you want to see after a long shift. I’m the only suit that encourages you to do absolutely nothing. What am I?

Heads, shoulders, knees, and toes, a song that shows where body parts go. Something is missing, it sits in the middle, extremities join to it, held firm and stable.

I have no arms, yet I hold, I bring you warmth against the cold. I never speak, yet offer you peace, I’m always there when you fall asleep.

I'm a professional sleeper with a very specific schedule. I’m the first thing you want to see after a long shift. I’m the only suit that encourages you to do absolutely nothing. What am I?