Sleep is one of the most important building blocks for a baby’s development.
During sleep, a baby’s brain is hard at work, processing everything they’ve seen, heard, and felt during the day.
It's also when vital growth hormones are released, supporting physical development, a strong immune system, and healthy brain function.
https://www.bbc.com/future/article/20220131-the-science-of-safe-and-healthy-baby-sleep