Green’s Dictionary of Slang

(UK Und.) sleepy.

1674		Head Canting Academy (2nd edn).
c.1698		B.E. Dict. Canting Crew n.p.: Peepy c. Peeping, c. Drowsy, Sleepy. As the Cull Peeps let’s Mill him, c. when the Man is a Sleep, let’s Kill him.
1725		New Canting Dict. [as cit. c.1698].
1754		Scoundrel’s Dict. 16: Drusy [sic] – Peeping.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1859		Matsell Vocabulum.