Research has shown gamma waves are continuously present during low voltage fast neocortical activity (LVFA), which occurs during the process of awakening and during active rapid eye movement (REM) sleep.

There is no cardiovascular or cardiorespiratory change as a result of this change in heart rate; it’s simply the affect on the heart of chemicals and nerves responding to an external experience.

our brain activity increases to the same level (alpha) as when we are awake, or even higher

Delta waves (below 4 hz) occur during sleep

Breathing and heart rate are regular

Breathing becomes slower

Brain is active and dreams occur

he heart beats about 60 to 80 times a minute when we're at rest.

The heart rate adapts to changes in the body's need for oxygen, such as during exercise or sleep

The results support a growing body of research on the potential stress-reducing health benefits of music, the researchers say.

heart rate slows

Most of dreaming occurs during REM sleep, although it can happen during other sleep stages as well

If REM sleep is disrupted one night, your body will go through more REM the next to catch up on this sleep stage.