top to tailadv.
/ˌtɒp tə ˈteɪl/, U.S. /ˈˌtɑp tə ˈteɪl/ With reference to the orientation of two or more people lying beside one another: with each person's head next to the adjacent person's feet.
ΚΠ
1941 Lethbridge (Alberta) Herald 18 Jan. 9/8 They told the people not to sleep with their heads close together, but top-to-tail, to prevent spread of infection.
1960 Guardian 4 Apr. 2/1 The two children, placed top to tail, contrived to wriggle themselves into positions of complete comfort.
1987 Sunday Times (Nexis) 1 Mar. [The family] were installed..in a room with one double bed and a single, on which her daughters slept top to tail.
2011 J. Riordan Blood Runner iv. 29 Fill the casualty wards first. Two to a bed, top to tail.
This is a new entry (OED Third Edition, September 2013; most recently modified version published online March 2018).
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adv.1941