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While researching insomnia, which is a thorny personal problem at present .........
When leaving alpha (a relaxed state) and before entering delta (deep sleep) we pass through theta.
Borrowing shamelessly from a web site:
"Theta Brain Waves have long been associated with early stages of sleep and the process of dreaming. Theta Brain Waves are of high amplitude and usually kick in when you experience powerful surges of emotion. Theta Waves have been associated with states of profound inspiration, enhanced creativity, “Super Learning,” deeper relaxation, day-dreaming, and sleep-dream activity.
Theta Brain Waves can kick in when you have a spiritual experience or while you are in a highly-creative state......."
There's the rub. How many of you feel profoundly inspired, powerfully emotional, and highly-creative when closing in on la la land?