nightlight

a small, dim light or lamp left on overnight

She had brought in with her the night-light that had been burning outside her door. She blew it out.

They made you give up / your nightlight / and your teddy / and your thumb.

light that shines at night such as moonlight, starlight, etc.

The floor-cloth deadened his footsteps as he moved in that direction through the obscurity, which was broken only by the faintest reflected night-light from without.

[…] the man held up two small objects faintly twinkling in the nightlight;