In a test of 216 infants aged 6 to 12 months, the researchers taught the babies three skills of playing with new finger puppets  Half of the babies slept a big sleep four hours after learning, but the other babies didn't sleep or took a nap for less than 30 minutes  The study shows that on average, babies with enough sleep can remember 1
Before the experiment, the intelligence level of the two groups was the same
5 skills, But babies who don't sleep much don't remember any skills