Since its a Sunday night during a holiday weekend without any big breaking news, I would suspect that's probably just a bunch of people that had automated sales at $90k, or something similar.
A common pattern is: people (I supposed I mean: investors) are somewhat worried that markets are over valued. They ponder, think, research, binge-watch Prof G videos... Then they travel to have Thanksgiving dinner with a bunch of in-laws. Market gets discussed over cigars. If they get a confirmation signal from the brother in law attorney or sister in law dentist that they are worried too...then after mulling it over on the flight back to Denver...the market dumps on Monday.
Love that HODL optimism. Looking at the longer charts there seems to be support around $80k so maybe. This could just be holiday shopping. The timing of economics with this though has me worried the support will falter causing a sell off and Monday’s bell will be a bloodbath.