Warning: Sunday night is when the Korean whales make sushi out of Bitcoin.
It has started already as you see and just gets worse as time approaches midnight (USA Eastern Time)
If you use my R and S stops and have good charts to watch price at the one minute mark, you can catch the bottom of steep falls, buy and then sell before it tops out.
Be careful as sometimes the price turns around and you have to sell before taking a profit and then bear a small loss.
If you use stop-loss it works, but in two cases today I did NOT use stop-loss and glad I did not because price recovered enough for a profit.