The pianist's late-night repertoire included several nocturns that mesmerized the small audience.

Teenagers sometimes feel embarrassed when they experience nocturnal emissions.

Many adolescents feel embarrassed after experiencing a nocturnal emission, not realizing it is a normal part of sexual development.

Historians note that nineteenth-century physicians treated nocturnal pollution as both a medical and moral concern.

Scientists studying urban air quality found that nocturnal pollutions can have unexpectedly strong effects on respiratory health.

Astronomers measured the nocturnal arc of the bright star to refine their models.

The old mariner used the term nocturnal arch to describe the faint curve traced by the stars after sunset.

We walked beneath the nocturnal arches and listened to the city breathe.

Scientists mapped the nocturnal arcs of the bioluminescent plankton as they drifted along the coast.

The hospice nurse kept a careful log of the patient's nocturnal deliria, noting triggers and calming measures.