彼は床につくや否や、眠ってしまった。

he; him; his; boyfriend

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

bed; bedding; sickbed; alcove; riverbed; seedbed; straw "core" of a tatami mat; floor

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to breathe out; to breathe; to tell (a lie); to use (foul language); to vomit; to throw up; to spit up

such things as (non-exhaustive list related to a specific time and place); and ... and; the minute (that) ...; no sooner than ...; as soon as; punctuational exclamation in haiku, renga, etc.; interjection expressing surprise; hi; plain copula; yes; what?; indicates a question

no; the noes

to sleep (not necessarily lying down); to die; to close one's eyes