Locking out worry

[ScouterE]

Hi all, when my university kids came home for the lockdown I developed a fear last thing at night when locking the front door that I could be locking them out even though that was illogical because they hadn't said they were going out and in fact by law were not allowed out after their once a day exercise. My brain painted pictures of them being outside in the middle of the night in the cold ringing the doorbell and banging the knocker and we didn't hear (again highly unlikely) which sent me into panic mode and I got a rush of adrenaline whenever I pictured that.

So I agreed with my (understanding) wife that that we could avoid me having those thought at all by leaving the front door with just the mortice lock on so that if they have keys (which they of course always should) they can get in,

But the anxiety then upped its game by deciding it was still possible that they might forget their keys (again highly unlikely) so it kept going. Now I hang around their bedrooms for an hour to watch them settle down for bed for ages and peer under their doors to see if their lights are on behind the closed doors. Even then it takes half an hour for me to sit down and get my brain to accept that they are 100% in bed, running through the proof multiple times before it will let go and accept that they are definitely in. By this time I'm frustrated and wound up and have to take a Zopiclone to sleep.

I dearly want to break this ridiculous habit if you have any suggestions? It seems the more I pander to it the worse and more illogical it's getting.