Please, I was trying to celebrate my exam success with "friends" of the online variety and only explained the drumming in response to a query so wasn't actually soliciting business or inviting a debate on the merits or methods of accessing different brain states
Spirituality isn't everybody's cup of tea but more of it seems to be gaining credibility as scientific research catches up with what practitioners and clients over around 30-40,000 years seem to have taken on trust, namely that it works.. I am not one of those involved in the research, but there is plenty on the internet if you care to google it - Dr Melinda Maxfield (PhD not medical) is one, just a small study for Stanford as I recall but there is also Dr Jeffrey D Thomson at the Centre for Neuroacoustic Research and the University of Birmingham for starters.. I'll try and look it up if you want but sadly I've not the memory for scientific data that I might like - I do know it works for my clients and that it works amazingly for me under the most diverse set of circumstances across a period of 8 years to date..
As for alpha during sleep, I've never advocated that -
as I understand it alpha is associated with internal processing and theta with meditational and trance states, intense creativity etc. Beta is the thinking alert state and delta (waking) has been linked to the experience of long term expert buddhist and yogi meditation that goes way beyond my ability

The kind of thing Zen Buddhists practising "no mind" techniques might achieve. This is a layman's understanding, I have my MSc in psychotherapy not in neuroscience or music research, but I apologise if I offend a pure scientist by quoting what I have been taught inaccurately - consider it the response of an ageing brain coming down from major week long sleep deprivation, exam stress and the effects of 2 very large glasses of vino rosso

Can I please just be happy for a bit now? I had a major piece of remedial work done on my shoulders yesterday afternoon by one of the tutors after giving her a combination of relaxation massage, reiki and shamanic fire energy (no I can't explain that in research either but she got it despite being a microbiologist!). My healing response - professional term for "it gets worse as a part of getting better" is quite severe to the point moving is a problem but I will be drumming tonight for my group no matter what, because it works and I am passionate about it, sorry again if that isn't ok with anyone but that's how it is.