I checked this for you, and what appears to be the best meta study I could find shows that the only correlation found was that long sleep duration increases the risk of one type of cancer:
The present meta-analysis suggested that neither short nor long sleep duration was significantly associated with risk of cancer, although long sleep duration increased risk of with colorectal cancer.
Re:“We have no reason to believe 5G is safe”
by not_a_moth on Monday October 21, 2019 @10:41AM
(#21312786)
"After just one night of only four or five hours’ sleep," Walker tells The Guardian, "your natural killer cells—the ones that attack the cancer cells that appear in your body every day—drop by 70%." Sleep deprivation has such serious outcomes that "the World Health Organisation has classed any form of night-time shift work as a probable carcinogen."
^Matthew Walker, presumably the 70% drop is from work at his Berkeley lab
We live in an increasingly sleepless society and lack of sleep is effectively a carcinogen.