You are going to laugh . . .
While MrsC was away, I might have let the cat have the run of the bedroom at night ('run' literally; she'd run in an out like a maniac, parkouring off the furniture, then go to sleep in her bed in the hall).
This didn't suite MrsC, so she (the cat) was shut out on MrsC's return.
Cue much scratching at door every night, bashing it to get it open. Every bedtime was a game of hide and seek, where she'd try to avoid being put out of the bedroom.
Last night, I dashed to the bedroom and quickly shut door to stop cat getting in. Unfortunately, she was sprinting behind me and ran headlong into the door (it wasn't even closed, she just couldn't turn in time).
so I went to bed concerned that she'd hurt herself. Never mind that she'd been running around the room purring afterwards, my mind couldn't help but think of concussion, bleeding on the brain etc.
By 4am, after a fitful night, I realised that the cat hadn't been scratching at the door. Not one little bump. So paranoia tripled and I became convinced she was lying dead on the floor somewhere.
Nothing for it but to creep out of bed.
Cat greeted me on the stairs, perfectly fine.
Cats! they stop you from sleeping even when they aren't doing anything!