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Douglas Harper's Etymology Dictionary
night-light

1640s, "faint light visible in the sky at night," from night + light (n.). As "small light used in rooms at night to keep them from total darkness" from 1851.

WordNet
night-light

n. light (as a candle or small bulb) that burns in a bedroom at night (as for children or invalids)

Wikipedia
Night-Light (Miyuki Nakajima album)

is the 39th studio album by Japanese singer-songwriter Miyuki Nakajima, released in November 2015.

Usage examples of "night-light".

Brennan coud discern few details in the dimness of the night-light that burned above the bar, but the men all had hard, tough faces.

This was always borne by Madame every night in ritualistic procession, Jeanne following with a silver candlestick and a night-light.

Javan murmured, pausing to take up the night-light set in a niche in the corridor before leading Charlan into the tiny room designated as his monastic cell.

Of course the Neverland had been make-believe in those days, but it was real now, and there were no night-lights, and it was getting darker every moment, and where was Nana?

It was safer to think of home- of quitting time in the fields, and the soft gray silk of clouds fading and fading, until that moment white domes all but glowed with strangeness and the night-lights around the Base walks, coming on with dusk, were very small and weak guides against the coming dark.

There were always twin double beds separated by adjoining nightstands topped with securely anchored night-lights, a long dresser atop which perched a swivel television, bolted in place.

Then, shockingly, for the first time in thirty-six years, since the playing of the final game of the last World Series before a solemn crowd of only three hundred die-hard fans, the night-lights of Battersea Stadium flared on, bathing the stained and tattered artificial playing field with harsh blue light.