When I can't sleep, it means too many thoughts come into my mind for me.

Alternative: "When I can't sleep, thoughts flood my mind."

If I really can't sleep, I tell myself it's okay,; a little less sleep won't affect the next day; b. But I don't check what time it is, because if I look at the time and realize that hours have passed since I went to bed, but I didn't fall asleep, it will give me more anxiety, and I won't be able to sleep at all.

Turning off my phone before bed and going to bed on time isare also helpful.

The subject is plural: "turning off my phone before bed AND going to bed." So "are also helpful" rather than "is also helpful."

Emptying my mind and focusing only on my breathing.

This sentence feels incomplete.

When I can't sleep, it means's because there are too many thoughts comeing to mind for me.

If I really can't sleep, I tell myself it's okay, a little less sleep won't affect the next day; b. But I don't check what time it is, because if I look at the time and realizediscover that hours have passed since I went to bed, but I didn't without having fallen asleep, it will give me more anxiety and I won't be able to sleep at all.

Turning off my phone before bed and going to bed on time isare also helpful.