Pro-tip: If you're a boss or manager, don't send email, Slacks, etc, outside of business hours. You might not intend them to be responded to until start of work, but it send a subtile message of "I'm working at 11pm or on the weekend, why aren't you?"
@grumpygamer Schedule Send is great for this. I'm compulsive about late working but I've learned to force myself to schedule the email to land during the next business hours.