Hk^Y mutants sleep less on day day and the severity of the short sleeping phenotype increases after the first week, peaking at day 25. Hk^Y flies continue being consistently short sleepers even on day 76.

Walking activity is not affected by age in Hk^Y flies, which remain hyperactive relative to their wild-type siblings from day 2 until death. Late in life, Hk^Y flies are hyperactive but are no longer short-sleepers.

Hk^Y flies exhibit an approximate 26% decrease in life-span compared to wild-type.

70-day old Hk^Y flies sleep more during both day and night, compared to 70-day old wild-type flies that exhibit increased sleep primarily during the day.