How to pronounce 一陣先 in Cantonese (6 out of 7):

唔理咁多瞓一陣先
So, you're going to sleep a little bit.

Cantonese Sentence Breakdown

ng4
oh (expression of agreement or surprise)
(Cantonese) not
to hold in mouth
to bite
lei5
texture
grain (of wood)
inner essence
intrinsic order
reason
logic
truth
science
natural science (esp. physics)
to manage
to pay attention to
to run (affairs)
to handle
to put in order
to tidy up
rationale of things
prison official
judicial officer
a surname
to polish
to regulate
to arrange
to repair
well-regulated
to review
to realize
to appreciate
to understand
orderly
咁多 gam3 do1
so much
fan3
to sleep (Cantonese)
Mandarin equivalent: 睡shuì [睡]
to lie down
sleepy
一陣先 jat1 zan6 sin1
in a moment
la5
“now”, with an connotation of doubt
surprise
disapproval