Both rate of recurrence (speed) and amplitude (height) of these waves changes as you sleep.
Not all of them wake the person up, so someone with poor quality sleep frequently doesn't are aware that he or she isn't sleeping comfortably. https://WWW.Digitaljournal.com/pr/news/press-advantage/celestial-stem-offers-high-dosage-options-for-pet-owners-looking-to-buy-cbd-pet-treats-in-mesa