Does it come to your mind that during weekends BTC and along with Altcoins hits the low prices on it's values? It is just like clockwork as if the price gets predictable somewhat especially when BTC hits an all time high, then it immediately if not ever so suddenly, or later "corrects", so it crashes about 4 to sometimes 20 percent.
It is really not a bad thing, it's healthy and allows traders especially the small ones the sweet opportunity to buy cheaper , so later they can sell if they want for a profit that they chose. Many traders call it a "Red Day" or a "Bloodbath" by some. Newbie traders just panic and they sell, sometimes for a loss, so it would turn bad for them.
Traders like me welcomes such an event for the reason I stated above. That is why I had fallen in love in crypto trading because some kind of force is just so kind enough for people like me get the benefit of making some income out of small effort but with caution in mind.
If you are not doing cryptocurrency trading, just observe for a while then you can learn and you will experience for yourself just how easy it is to earn and maybe lose some money if you are not careful.