When does Smart Wake aim to awake you?

[FidRewe]

With a healthy sleeping pattern, deep sleep should not occur in the morning anyway. So at which point in the sleep cyle does Smart Wake aim to awake you? At the end of a REM stage would be ideal. Or does it just pick the next time you're awake anyway?

[cathm]

Hi @FidRewe 

When setting an alarm, turn on Smart Wake to allow your watch to find the best
time to wake you starting 30 minutes before the alarm time you set. It avoids
waking you during deep sleep so you're more likely to wake up feeling refreshed. If
Smart Wake can’t find the best time to wake you, your alarm alerts you at the set
time.

[FidRewe]

Hi, this is exactly what one can find in the official description of smart wake, so my question goes a bit further than what's revealed there. I'd like to know, if smart wake awakes me before or after REM or anytime I'm briefly waking up on my own.