My ranked.

This is a quick story about my ranked, with a question at the end.

I've played about 330 games in ranked so far this season, i've climbed from bronze III to silver II. i played about 100 games from bronze III to silver IV. Then i got stuck at silver IV for about 180 games. Ever since then, my match history has shown a repeating pattern. I go on a huge win streak, for example, 8, or 10. Afterwards, i go on a loss streak of about half that, say, 5. Then there's a long stretch of win / loss / win/ loss / win / win / loss/ loss/ win / loss until i finally get into another win streak again. After that, ofc, a loss streak. Then back to the win / loss / win / loss.

Why does this happen? It's happened about three times now. Anybody have any ideas? or just a coincidence.

A few more notes: I find that i play best at around midnight, i'll stay up longer when i'm on a win streak, and every huge win streak i stay up until i get to my promos, which leads my sleep schedule to be weird because i fell asleep at around 6 am. As soon as i get on the next day, while having more than 8 hours of sleep, i go on a losing streak; until i get into a long pattern of 50% win rate.

Edit: i forgot to add the "ranked" filter, please do so.