"Every night we get tired and go to sleep. Human spend about a third of our lives asleep. Sleep seems essential for all animals that have a nervous system but nobody really. He knows why a team of Israeli researchers reported findings in two thousand nineteen that might help resolve this mystery dime. The researchers studied Zebra fish an animal. That's commonly used for many kinds of genetic and physiological research church because the bodies and skulls of Zebra Fisher transparent the researchers could use a high powered microscope to look directly at chromosomes inside single nerve cells in the brains of living fish both. During sleep and Wakefulness the chromosomes contain a cell's DNA and are involved in controlling cellular processes is pretty amazing that they could look directly at brain cells in the living animal what they find out about sleep keep the researchers were surprised to find that chromosomes in Zebra fish brain cells were more active during sleep than during wakefulness. They think that what this means is that during sleep the chromosomes are undergoing an active process of maintenance. Maintenance and repair the repairs needed because during the day D._N._A.. Accumulates damage due to cellular processes including those involved in neural signaling the cells need a quiet time to repair their chromosomes and sleep provides it. That's right now. The researchers want to make sure that their findings can be generalized to other animals besides Zebra fish including humans if they do science may be well on the way to explaining why it is."