Sleeping ...

Poplar Hawk Moth(s) © C.Duyn

I spotted what looked like an unusual leaf at the bottom of a branch of my Contorted Willow Tree in the garden.
It turned out to be a Poplar Hawk Moth.
Well two actually.
Mating.
But they sleep during the day.
So are they sleeping 'on the job' so to speak?

Poplar Hawk Moth(s) © C.Duyn