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Also called bedmate. a person who shares one’s bed.
an associate or collaborator, especially one who forms a temporary alliance for reasons of expediency:
Politics makes strange bedfellows.
Historical Examples

As she spends the day here and is out larking at night, she is not much of a bedfellow after all.
Birds and Bees, Sharp Eyes and, Other Papers John Burroughs

We were afraid of awakening her bedfellow, and kept perfect silence.
The Memoires of Casanova, Complete Jacques Casanova de Seingalt

He first made an attempt on the apprentice, his bedfellow; but he struggled so far as to effect his escape, and hid himself.
The Chronicles of Crime or The New Newgate Calendar. v. 1/2 Camden Pelham

I had exchanged my brother John as a bedfellow for Walter Packard.
The Story of a Cannoneer Under Stonewall Jackson Edward A. Moore

I recline on my elbow and watch a lark near by, and then awaken my bedfellow, to listen to my Jenny Lind.
Canyons of the Colorado J. W. Powell

The next moment his bedfellow was “covered” with two “guns.”
Roosevelt in the Bad Lands H. Hagedorn.

My bedfellow and I slept on an oilcloth, covered with an overcoat, and tied our four feet up together in a flannel shirt.
Under the Stars and Bars Walter A. Clark

And you have the lively picture of it, every night for your bedfellow.
The Visions of Dom Francisco de Quevedo Villegas Dom Francisco de Quevedo

The familiar appellation, of bedfellow, which appears strange to us, was common among the ancient nobility.
King Henry the Fifth William Shakespeare

Older; it has a white head, and shall never die till she be buried: her wrongs shall be my bedfellow.
The Mermaid Series. Edited by H. Ellis. The best plays of the old dramatists. Thomas Dekker. Edited, with an introduction and notes by Ernest Rhys. Thomas Dekker

noun
a person with whom one shares a bed
a temporary ally or associate
n.

“close friend, roommate,” mid-15c., from bed (n.) + fellow (n.). Also (late 15c) “concubine.” Earlier in the “close companion” sense was bed-fere (early 14c.). Bedsister “husband’s concubine” is recorded in Middle English (c.1300).