zeds
noun
1
sleep. Royal Navy slang; echoic, based on UK pronunciation of 'z', from the strip-cartoon legend 'zzzz' as an indicator of sleep. Used in phrases such as 'racking (or piling) up the zeds' (sleeping) and 'zeds merchant' (someone who likes to sleep) UK, 1989.
2
central nervous system depressants UK, 1983