The genetic variants associated with both sleep efficiency and sleep fragmentation are rare.
Hence, these variants may not be present in your DNA raw data file - and as a result, absent from your report as well.
Here’s some information on sleep efficiency and fragmentation:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5479574/
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0223632
