What if I wake up at night, and when I try to sleep, nothing comes of it?

For the 5th day I wake up at night at about the same time, and when I try to sleep, I can't. I feel a little drained. The temperature in the room is less than 20 degrees or even less than 15. There are mental disorders, including depression. Constant feeling of anxiety. What to do? And what is i...

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