Put away that email you are about to send out and read this: Your Late-Night Emails Are Hurting Your Team. The same is true for the Sunday evening emails. Stop sending them.
Once you do that, look at how many emails you send out and try and find ways to reduce that, either with meetings, quick chats, or other media (e.g., internal blogs, status updates).
The result will be a better informed and a more motivated team.