A delta wave is a high amplitude brain wave with a frequency of oscillation between 0.5–4 hertz. Delta waves, like other brain waves, are recorded with an electroencephalogram and are usually associated with the deep stage 3 of NREM sleep, also known as slow-wave sleep, and aid in characterizing the depth of sleep.

The Bedtime Challenge: Go to bed 5 min earlier every week for 12 weeks and feel like a superstar!
Follow the #bedtimechallenge playlist: http://phonofile.link/bedtime_challenge

Giveaway! Win 150 dollars. How to join:
Tag your progress on Instagram by taging a picture of your clock before bedtime with the following hashtags #bedtimechallenge & #asmrsleeptriggers

We will pick out two winners at the end of the contest.

What kind of sounds do YOU want on the upcoming episodes?
Sweet dreams.