StandBy counts towards Screen Time

Since iOS 17 arrived I’ve been using standby mode on my bedside table whilst I sleep. A couple weeks ago I noticed my screen time was up 50%, which worried me. I didn’t look into it much, I just set some restrictions on the apps I use most frequently to put my mind at rest. A day later my screen time is still astronomical - so I look in settings and it says the “clock” app has been used 8-10 hours every night…

Why on earth does standby mode count as screen time when I’m literally asleep?