"heavy night" is a correct and usable phrase in written English.
For example, you could use it in a sentence like, "I'm so exhausted after this heavy night out with my friends."
For Romário, one of Brazil's greatest-ever strikers, it was different: he claimed that a heavy night was an integral part of his success, and that he actually played better if he had been out the night before.
"Thursday is a heavy night for time shifting," Adgate said.
"I had a bit of a heavy night.
Blood-shot eyes and a leery smile suggested a heavy night.
Even the Hollywood glitterati get the munchies during a heavy night at the Academy Awards.
"You come in from a heavy night and she'd be zapping around everywhere.
After a particularly heavy night he would send a poet friend, John Betjeman, to take his classes.
It is a cheap high: a bundle costs between £3 ($4.75) and £5, and two would make a heavy night.
Hey, that's not a bad start even if you're living there (well, maybe after a heavy night as well).
The first comes in Casino Royale, when, after a heavy night at the gaming tables, Bond sighs "Champagne and Benzedrine!
Because they're about as likely to stand up in court as Oliver Reed after a heavy night.
