The laptop falls asleep, but the wireless headphones remain on - a bug or a feature?

Question

Bluetooth

Fresh laptop Lenivo Ideapad 3, wireless headphones SONY WH-CH510:
I watch, say, a movie, the sound goes to the headphones. I close the lid - the laptop falls asleep. I open the lid after a few hours - the headphones are turned on and connected to the laptop - immediately in a "combat" state. Very comfortably.
With the old laptop it was different: I close the lid - the headphones say that Bluetooth is disabled. After a couple of minutes - they say that the headphones are turned off. When waking up the laptop, the headphones had to be turned on in a new way.
In all this convenience of interaction between headphones and a new laptop, what mode are the headphones in when the laptop is sleeping? And will the entire charge of the headphones go away while they are waiting for the laptop to turn on?

Answer 1

Since the laptop is fresh, I believe that it no longer falls asleep in the usual sense, but uses S0ix , which is why the power on the Bluetooth module does not disappear, the connection is not lost.