Alpha and Delta options

At the beginning of sleep, the brain generates alpha waves (frequency of about 12 Hz) and Delta waves (less than 4 Hz frequency).

Delta waves are the slowest frequency and higher amplitude. They bring a deep peace. It is during stages III and IV of deep sleep they are generated, along with the secretion of melatonin by the pineal gland (For more info) and somatropin pituitary hormone favorable growth in cell regeneration.

Stages III and IV are the most important phase of sleep. Their duration tends to decrease with age, overwork and stress.

Therefore Night Pole offers a "Delta" option to support deep sleep, with or without "Alpha" option, which accompanies the sleep program (about an hour before swinging back on the constant field North magnetic Pole).