. . . study of rats, man its either
"if this idea proves true in people, it could have many implications for human learning. It suggests that those idle times, perhaps spent gazing into space, are actually crucial for our brains to replay, and learn from, recent experiences. "
or "Maybe zoning out is intrinsically hazardous in excess. Daydreaming might be intrinsically harmless but ultimately detrimental if it cuts into time spent in healthy mental exertion. Or, perhaps the Alzheimer's disease process begins earlier in life than we usually assume." Daydreaming and Alzheimer's disease