Well, there are plenty of pillow threads already.
However
:
I don't find fixing a pillow to the mat useful. It's not how I sleep, and my mat/the position of myself upon it aren't always arranged optimally within the shelter due to terrain/slope to make a fixed pillow work.
The several air pillows I've tried are either too small, too thin , puncture/leak, too heavy...
I went back to a stuffed ( buff covered) drybag as a main pillow. I just find it more comfy than an air pillow. I take the clothes I need for camp in the coolest temperature I could expect to encounter. On multidays this is variable due to weather or camping at different altitudes; so I'll often have a layer spare to stuff for pillow, or at minimum, waterproofs/mitts (and if wet I've turned a drybag inside out before).
I do sometimes on longer trips, take a tiny 40g
mammut air pillow which is only useful as a sleep pillow inside a hooded bag, but good as an extra support layer for reading in bed.