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If they are using Google Workspace they will get pretty decent super from Google. You can also check the reports to see if the email even made it as far as the mail server - some items are blocked before they even hit the spam folder.

That is called a hypnic (or hypnagogic) or myoclonic jerk, it's pretty common just before you fall asleep.

You could quite easily use this technique when your child is in bed, before your usual bedtime. It would be an interesting thing to try in the evening when you're stuck on a coding problem.

It's only really useful if you can get to that stage of N1 sleep quite quickly anyway so it wouldn't apply to all people. I don't think it's the domain of childless millionaires.