The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

She is finally ASLEEP.
Breaking Bad Season 2, Episode 12

Only when I'm ASLEEP.
Game of Thrones Season 3, Episode 2

but no sooner am I ASLEEP
than they creep forward again.
Vikings Season 1, Episode 9

Either they fell ASLEEP
or they conspired with the enemy.
Game of Thrones Season 5, Episode 9

The baby's ASLEEP.
Can we put her in your room?
The Big Bang Theory Season 10, Episode 12