I'm stressed out and when I try to go to sleep I can't shut off my thoughts. What should I do?

Try listening to music. Find the music that calms you down, download it on your phone and put headphones on. It could be weird at first but trust me you'll get used to it and soon you won't have any problems with sleeping. It surely helps me. :)

Take a melatonin, if recommended. Also, breathe in for 5 seconds, out for 10. Deep breathing helps.

Try a progressive muscle relaxation activity, starting with toes and up to head. You can tense up muscles and deep breathe for 20 seconds, then release for 20 seconds. Move to next muscle, and all the way up. Starting with toes, tense toes and release, then arch of foot, then release, then ankles, then release, calfs, etc. If I am deep breathing during this, I usually fall asleep before I get to my shoulders. If not, my body is completely relaxed when I'm done and I drift off.

If you can't sleep due to stress, do something that will keep you away from thinking e.g.. playing a game on your phone whilst on bed

Try to wear yourself down before sleep. Either by exercise, chamomile tea, or doing something that consumes energy. Or try to rid yourself of the cause of the stress. Also, eating too close to bedtime can cause your body to keep going. Or, keep telling yourself to stop thinking about it for now and to get some rest. Although that sounds like it's easier said than done, just try to say it out loud to yourself. Talking yourself through things. I have personally found exercise to work the best, make yourself so tired that you just pass out (obviously in a healthy way.)

You should try and find ways to relax yourself. Have a walk around the house, get a snack, read a book or take a quick shower. You could also do some exercise during the afternoon so that you are exhausted when you go to bed hence not worrying about your thoughts. Relaxation music and meditation also helps. Find a time during the day to give importance to your thoughts, sit down and have a time for yourself, a time to listen to every thought (introspection).

Usually what I do in this case, is literally stay up :p I use this as an opportunity to watch anime or play handhelds games that I'm a bit left behind with. Eventually, after a short while of playing/doing whatever it is your doing, you'll fall asleep as quick as sudden rain.

well dear use proper bed,mattress,stretch and relax it will help you and try to limit caffeine eat dry fruits before sleep

I drink something warm or eat something warm.. then I listen to soft music via headphones, lay my phone down and keep it on silent. and I usually tend to fall asleep.

Turn on a light and grab a piece of paper and a pen. What are you stressed out about? Write it down. Then think about a few things you can do to relieve those stressors and write them down as well. Leave your paper on a positive note with writing something like, "I will take charge of this tomorrow!". Go to bed knowing that in the morning, your work is waiting for you on that paper, but tonight, your mind is in your bed, getting you rested up for the day ahead.