How to Relieve Sunday Night Stress:
You don't have to go crazy with this one and schedule every second of your weekend, but if you can then make a rough copy of your weekend. I like to take a piece of paper and write down all that needs to get done during the weekend. I then take sometime to organize when I am going to do each thing. This helps me to focus on what needs to get done, so I don't procrastinate and leave everything for the last minute.
2. Plan Ahead
This may sound like the first tip, but its different. This doesn't involve doing actual "work", but it does set you up for a successful week. I you are going to a certain event/place during the week then make sure you have an idea of what you are going to wear/how you are going to get there/directions ect. It will help a lot to know these things in advance because it will take way stress from not just a sunday night, bit also the entire week!
Now that you have finished all of your work (because you have planned it in advance) you should have some free time. This should be a couple hours or so before you go to sleep because it will help you wind down. At this time, I usually take a nice bubble bath, have some tea, and then cuddle up with my computer and watch an episode of Friends (Call me basic, but its a great show!). If you don't have as much free time then you could make a hot chocolate, read a couple pages in a book, paint your nails, ect. Sometimes I will even sit on my floor, close my eyes, and take a few deep breathes. This lets me exhale all of my stress and breathe in fresh air which allows me to conquer the new week ahead.