I have trouble sleeping at night... can you help me guys?

sometimes i dont get enough sleep for 2-3 days... my resistance is low and i'm prone to get sick... what should i do? when i'm about to sleep my mind was so powerful that it creatds a throwback moments when i was a child and highschool, mixed memories but the usual things i saw were the things i failed or unfortunate happenings... i also feel suffocated sometimes
I have trouble sleeping at night... can you help me guys?
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