These are called noctilucent clouds. There was mention of this on SO's 3-min news segment this morning. He made the comment that these aren't so "rare" anymore.

I personally, have not seen them, so I can't really comment on them. You may be seeing them since you are at a higher latitude? Maybe they are being seen at latitudes below the auroras (aurorae?).

Noctilucent clouds could definitely be an explanation around your observations of blue "cloud-like" waves around the moon. From what I understand, these clouds form much higher up in the stratosphere, so they would not be effected by wind. I.e. you would see other clouds move while these appeared stationary.