Not sure if it was Dogen or some other Zen guy who said that one should sit like the head is on fire.

Anyway I donīt really know how to relate to that, any thoughts on that?

And also when I sit I often (sometimes just in a few minutes) end up sitting really relaxed in most muscles, just the spine holding the posture, breathing getting really slow, and the mind quieting down. In other words something of a samadhi (or deep absorption) experience. Is it a good thing to be able to easily quiet down in sitting? Or do I miss the mark of shikantaza through going for that stillness of relaxed sitting.

Hope you understand (itīs a bit late and Iīm of to sleep).