The laying on the floor like that is similar to what Sharon Butler has you start with in her TOS program.
Although I think she suggests 3x a day if possible.
She doesn't mention lifting the head with books or ?
- but my PTs suggested it because of my c spine issues, I just use a low pillow or rolled towel

Butler also suggests placing arms out to the side at your own comfort level- this loosens/stretches the pec minor and is good for beginning to release any adhesions in the area.

Helps to gently offset our forward shoulders postures.
And a great way to do your relaxing and focus on diaphragmatic breathing.