According to @BullTheoryio, Bitcoin (BTC) erased roughly 16 hours of gains in about 20 minutes immediately after the U.S. market session began on Dec 8, 2025. According to @BullTheoryio, data since early November shows BTC has sold off most of the time shortly after the U.S. market opens, with similar behavior observed in Q2 and Q3. According to @BullTheoryio, this points to a recurring 10:00 a.m. ET sell-off window that traders can monitor for elevated intraday downside risk.