Sleepyhead.

A little bee (probably

Diadasia diminuta)

sleeping in a desert globemallow flower (Sphaeralcea ambigua). Members of the Diadasia are sometimes called chimney bees, for the turreted entrances they construct for their underground nests. This species specializes on globemallow pollen. 

At the xeriscape garden at the Glendale Main Library, Glendale, Arizona.