There is a molecular basis for many sleep patterns and disorders involving circadian clock genes. In humans. "short-sleeper" behavior has been linked to specific amino acid substitutions in BHLHE41 (DEC2). yet little is known about variation at these sites and across this gene in mammals. https://www.bekindtopets.com/deal-alert-NHL-Winnipeg-Jets-Distressed-iPhone-13-Pro-Max-MagSafe-Case-p96268-great-save/