Prior to electricity and the industrial revolution, most people in Western cultures slept in two 3-4 hour shifts, separated by about an hour of being awake, every night. They would go to bed at 8 or 9, wake up at midnight for an hour or so, then go back to bed for another few hours.

With the invention of electricity and lighting, people pushed back the time that they would go to bed, and when the industrial revolution happened, there was an emphasis on productivity and not spending much time in bed.

Also, they have done studies on the sleeping habits of modern indigenous tribes that live without electricity. The studies found that these people sleep an average of around 6 hours a night, and don't have problems with sleep disorders like the modern western world does. So it seems like electricity and screen time definitely play a role in sleep quality.

I have similar sleeping habits to you, and went down the rabbit hole of looking into our ancestors sleeping habits. Let's bring second bedtime back.