accumulate

But more and more evidence is accumulating, which suggests that REM sleep was absolutely critical to the evolution of the special cognitive capacities that human beings evidence, and our special creativity.

For example, resetting the epigenetic clock can't help with mutations in our DNA that accumulate throughout the course of our lives.

These are cells that accumulate in all of our bodies as the years go by, and scientists have noticed that these cells seem to drive a range of different diseases as we get older.