A while back I got into the best productivity habit ever: don’t check e-mail before midday, and only check it twice, at around lunchtime and around teatime. And when checking it, try to be as fast as possible: make decisions, or put things on my todo list, rather than letting e-mail sit there. Exceptions on days when waiting for an important e-mail. This is a habit I have lost—time to regain it! Sticking notes on computer to remind me of this.