A recent study concluded that the connection between sleep and the formation of memories starts breaking down as we age, reports Healthline.

“You can’t cement those memories into the brain so you end up forgetting the next morning rather than remembering,” said Walker, the co-founder and director of the Center for Human Sleep Science and author of the new book “Why We Sleep: Unlocking the Power of Sleep and Dreams.”

“As you lose those brain cells, you can’t generate that same depth and quality of sleep, nor can you synchronize those brain waves either,” Walker told “CBS This Morning” in an interview last month.