The first three stages of sleep are characterised by three types of brainwaves: alpha waves, theta waves and delta waves. The former are typically recorded when we’re in the process of falling ...
my alpha wave activity remained high during my nap, which indicates that while I was resting and in light sleep, I didn't go into a deep sleeping stage. I suspected that would be the case for a 25 ...
Alpha waves (8-12 Hz) happen when we are relaxed with eyes closed, as in meditation. Theta waves (4-7 Hz) are common in the lighter stages of sleep or the transition from waking to sleeping.
This alpha brainwave is what is present when we are relaxed and conscious. To induce sleep (a delta brainwave of 5 hertz), a person may need to devote at least 45 minutes, in a relaxed position, ...