I, like so many people, keep a lot of tension in my neck and shoulders. Some days it feels as though my neck is made of steel, but not in a good way.
The reality is that I don’t even realize how tight those muscles are until I lie down and try to relax.
So I have made a meditation of this for bedtime. Instead of focusing on the sensation of my breath, the focus is on releasing the tension in my neck and upper shoulders.
It may sound like I would not be able to squeeze an entire meditation session out of this, but oh, I can.

Lying down on my back I inhale, and then with the exhale, I focus on my neck and relax it, releasing the rest of my body along with it. With the following exhale, I do that again. That’s because while I may think that the initial release took care of the tension, there is still tightness there and I really have to work on it mentally to release that.
It’s as though my neck muscles are springs that I can stretch, releasing tension through the exhale, but once I let go (inhale) the “memory” in my muscles tightens them up again.
It helps to imagine my body melting, as if I’m being drawn downward into the Earth.
I can keep going like this, feeling my chin inch slightly towards my chest as the tension releases. Melting into the mattress. The more I release, the more subtle the sensation, yet very satisfying. The more I relax, the more deeply I breathe and everything lets go.
The awareness of what is going on in my body helps so much, but the tension is tenacious. This is not surprising, given how much mental weight my neck and shoulders bear. So it is a dance between releasing and returning to release again. Little by little until I eventually fall asleep.