John Gill Commentary Proverbs 23:34

"Yea, thou shalt be as he that lieth down in the midst of the sea, Or as he that lieth upon the top of a mast." — Proverbs 23:34 (ASV)

Yea, thou shall be as he that lieth down in the midst of the sea Not in the open sea, and the waves of it, there fluctuating and tossed about; nor in an island encompassed by sea; but in a ship at sea, a drunken man reels and tumbles about, just as a ship does at sea; hence the motions and agitations of it, and of the men in it, are compared to the reeling and staggering of a drunken man, (Psalms 107:26Psalms 107:27) ; or as he that lieth upon the top of a mast: where the motion is the greatest.

Or all this may be expressive of the dangers which a drunkard is exposed unto, and of his stupidity and insensibility; for though he is in as great danger as one in the circumstances described, in a storm at sea, yet is not sensible of it; which agrees with what follows.