I'm interested in "how much less sleep" and two copies of the gene as compared to one. Wonder what you would get if you were homozygous for both short sleep ge

I'm interested in "how much less sleep" and two copies of the gene as compared to one. Wonder what you would get if you were homozygous for both short sleep genes. Both of them seem to shave off about two hours, but my guess is that they wouldn't perfectly "stack" and you'd end up needing five hours.