If you set aside emotions and look at the dry mechanics, the picture becomes interesting.

Over the past ~4 months, the market has repeatedly formed a local high or the start of a decline precisely on Monday.
The idea is simple: roughly speaking, if you shorted BTC every Monday, statistically this would have paid off in 18 out of 19 cases.
It’s important to be clear right away:
this is not a “holy grail strategy” or a signal. It is a recurring temporal pattern worth understanding — not blindly trading.
Why does this happen.
First, the weekend is a thin market.
Low liquidity, sharp moves, emotional entries. On Monday, the bulk of volume arrives and redistribution begins.
Second, Monday is a day of profit-taking.
If there was a rally on Saturday–Sunday, it is often used as an opportunity to unload longs and shake off excess optimism.
Third, derivatives mechanics.
Funding, position restructuring, leverage squeezes — all of this often concentrates at the start of the week.
This is clearly visible on the chart:
most of the arrows point to Mondays where the market either reversed or began a downward impulse.
There’s even a note marked “invalid Monday” — an honest admission that the pattern doesn’t always work. And that’s fine.
What’s worth paying attention to here.
Monday is not a reason to enter a trade.
Monday is the moment when the market most often reveals its true intention.
If you enter over the weekend on emotion — the market often takes that away at the beginning of the week.
If you observe structure, volume, and context — Monday becomes an excellent point for assessment, not for guessing.