I lift on the regular, train with a PT that specializes in mobility and strength who works with pro athletes. If I don't adhere to a nightly, consistent stretching regiment before bed that includes a bit of yoga and a number of other key movements, I sleep like poo.
Highly recommend the book; Becoming a Supple Leopard [1]
[1] https://www.amazon.com/Becoming-Supple-Leopard-2nd-Performan...