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I wonder if reading stimulates an ASMR response in you? This stands for autonomous sensory meridian response. Many youtubers deliberately try to create this to help viewers to sleep. A mild response will just feel like intense and pleasant relaxation which often leads to sleep, stronger responses involve tingling sensations in the scalp and spine leading to deep trance-like relaxation.
As you like reading, so you're not bored, and this has always been an issue, it may be worth googling asmr to see if it seems to be the likely culprit. If so, counter-stimulation, like loud rock music, might help.
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