Bitcoin's price dropped below $91,000 on Thursday, driven by unexpected weakness in the Asian trading session. The cryptocurrency fell to $90,084, marking a 2.7% decline. This session, which has been a strong source of buying support since October, failed to maintain Bitcoin's recent rebounds above $94,000. The decline comes as the Fear and Greed Index stands at 29, indicating a cautious market sentiment, while volatility is measured at 2.47%. The inability of the Asian session to sustain Bitcoin's upward momentum highlights potential challenges in reaching the $100,000 milestone.