Hey there :) I've just watched the video ,to be exact, I've jumped right into the "12:29" bit! :D .well ,obviously he was recalling some "critical moments" ,but ironically ,the guys were sleeping haha ,even the interviewer was kinda surprised! lol .. Anyway ,the phrase was : "Gonna catch few Z's!" .it's a slang phrase"Us informal mainly" , that means to take a nap ,to sleep etc. Z's >> is plural ,and simply means "a lot of zzz!" ..z is a symbol for sleep! ,you must have seen it in comic magazines ,when someone is asleep ?? :P . to catch the Z's ..means to have some sleep ,to fall asleep ,usually out of tiredness !. Check Cambridge Dictionary here ..https://dictionary.cambridge.org/dictionary/english/catch-cop-get-some-z-s All the best . :)

Catch a few Zzzs on the way, :) Zzzz as in sleep