How do you block thoughts out from the past when trying to sleep?

I personally struggle with getting a good night's sleep. Every night thoughts from my past enter my mind and I stay up for hours because I can't stop thinking about them. But if the memory is particularly depressing or horrible, it helps to have a good cry. I then think of happy thoughts, encouraging messages, and wonderful moments in my life. If that doesn't work, then I read or write to help me fall asleep. Sometimes I take a few deep breaths and meditate for a while. With these tips, I fall asleep eventually and wake up refreshed.

Think about the future instead, think about how has been your day, how can you make it more productive? think about the things you like most and what makes you happy.

well i distract and calm myself by taking a hot shower/bath, brushing my teeth, drinking a cup of hot tea and watch funny tv series and eventually just fall asleep.