We've all been there before — it's midnight when you suddenly remember a work email you promised to send at the end of the day. You're tempted to send an email right then and there because you either have a deadline or you don't want to forget to send it again the next day. Before you make any rash decisions, stop and consider the situation. Unless the email is an emergency and you actually have people waiting to hear back from you, then I advise you hold off on it till the next day. It's also OK to send it if your colleague lives in a different time zone where it's daytime to your night. Here are reasons against sending late-night work emails: