Morning person, you might have Neanderthal genes to thank.

The two groups lived for hundreds of thousands of years, hunting and gathering plants, before disappearing from the fossil record 40,000 years ago. Some of the genes that are found in most living humans may have an advantage over other genes. Neanderthals and Denisovans might have had immune genes that protected them from new diseases that had not been seen in Africa. The genes from Neanderthals and Denisovans that became more common over generations were related to sleep. The daily rhythms of extinct hominins may have been influenced by the genes they had. In the cell of every animal there are hundreds of cells that react with each other in a 24 hour cycle. They compared the versions of the genes in the extinct hominins to the ones in modern humans.