The tl:dr... don't sleep late.
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Circadian Math: 1 Plus 1 Doesn't Always Equal 2:
In all animals, vertebrate and invertebrate alike, one of the defining features of sleep is the "rebound", i.e., the making up for sleep debt after an acute sleep deprivation event.
This month's Science Cafe (description below) will be held on February 17th at The Irregardless Cafe. We will be meeting Dr. Yvette Cook from the Rex Hospital Sleep Disorders Clinic.
Nicole Eugene recently defended her Masters Thesis called Potent Sleep: The Cultural Politics of Sleep (PDF) on a top
Australian blue wren females too are notorious hussies in this vein. I'm not sure to what extent the rising time of the male partners might matter though, because apparently the females listen to neighbouring males' songs during the day and flit away at night for some extra-marital hanky-panky with the fellas who sound particularly scrumptious...