A way to tell a friend to get some sleep, as opposed to "Carpe Diem"; a send-off to an underslept buddy, can also be substituted with "Carpe Z-em"
Bro 1: "man, i've gotten like 5 hours of sleep all week..."
Bro 2: "what the hell are you still doing awake man?? SEIZE THE Z'S!!!"
Bro 1: "wtf!?"