I've been researching the subject of affirmations and the relation with alpha waves over the course of the last few days.
I've found a significant amount of general information on the importance of performing learning/creative tasks during the alpha state, many of these sources indicating such a state as being ideal for self-suggestion.
On one of the articles I stumbled upon, the following statement was made:
The subconscious mind is most open to helpful and beneficial suggestions while we are in the “alpha” brainwave state—our most relaxed state of mind. The alpha wave frequency is often achieved in a meditative state or just before falling sleep, creating an optimal time to receive positive affirmations.
Such statements seem to run abound when running online searches, however, I have been unable to find any study to support statements like these; that could indicate the "openness" of the subconscious to "beneficial"/"helpful" effects to suggestive events when the brain is operating in the alpha band.
I am looking to find published research that could support to some extent statements like those.