Green’s Dictionary of Slang

1. (Aus.) a snore; also as v.

1968

D. O’Grady A Bottle of Sandwiches 49: From the zedding sounds floating upwards, I assumed they had both past out.

2. (orig. US black) a sleep, a nap.

1993		B. Moore Lex. of Cadet Lang. 438: usage: ‘I had a good zed during the last lecture.’.
2023		Twitter 25 Feb. 🌐 Even the most dapper girl about town needs her zeds.

3. see z n.¹

4. see z n.² (1)