On my so&so iphone,I use the lock screen, without a password or anything so it's quick & easy to use again when I need, but I only don't actually lock it because I'm on my own, & no one has access to my phone. When I'm with more people I'd use a bit of security so no one could access it when I'm sleeping or if I leave it lying around.
Or if you don't mind the wait, simply turn it off overnight. Start it up when you wake. Any messages or calls you miss, you';; be notified about, or can check for yourself to see if anyone tried to contact you.
Of-course you do have to consider that either someone you know might want to contact you urgently, or you might need to call emergency yourself. & you can't do that if your phone is powered off.
I think, using the lock screen is best, so it goes dark until you touch the screen again. I tried the face recognition but it was unreliable in dim light, such as where you may be sleeping. Keying in a four-digit code is too slow. In any event, you can make a call to 000 if you need without unlocking the phone first.
Just press the right hand side button 5 (five) times, or simultaneously press both the right -hand button & one of the volume buttns on the left-hand side. Then the Emergency bar appears in the centre of the screen. Activate that to call 000.
I know that was a bit off topic, but it occured to me, while thinking about what to do do with the phone overnight, should the need arise, & you've thought to turn your phone off... no, I think, really it is best to leave it on, but in lock screen mode. Then, you won't see it unless you choose to.
Hope that's helpful.😸
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I am also tempted to check what the time is, when I haven't gotten to sleep, or when I wake & it's still dark, or when there is a noisy neighbour & I think, if I want to make an official complaint, I want to tell them what time the noise woke me... I find it does not help me to know what time, how long I've tossed & turned - just makes me feel more frustrated. Lately I'm doing better at not finding out what the time is.
I know my sleep is erratic, so what does it matter?
If I'd had to get up for an appointment or if I had a job, I'd've been in trouble this morning! Tomorrow I do have to get up at a more reasonable time though, so I'd better not stay up too late tonight.
mmMekitty