Bitcoin in a Bear Market: What the Sleep Test Actually Tests

Here’s a sentence that sounds like a contradiction: bitcoin has produced some of the best long-run returns of any asset over the past decade, and it has also spent stretches of multiple years down 70% or more from a peak. Both are true. Holding them together in your head is the entire skill of owning it, and the sleep test I’ve written about before is how I hold them together in practice.

A bear market is when you find out what that test was actually measuring. Short version: it was never measuring courage. It’s measuring size.

The Drawdown Record, Plainly

Using widely cited cycle peaks and troughs, bitcoin’s major drawdowns have looked roughly like this:

Cycle	Approximate peak-to-trough	How long underwater felt
2011	About -90%	Months, but brutal
2013–2015	About -85%	Roughly two years
2017–2018	About -84%	Roughly a year to the low
2021–2022	About -77%	Over a year, plus the 2022 contagion

The exact percentages vary by which exchange data you use — the early markets were messy — but the shape is consistent: declines of 70–85% from a cycle peak have happened more than once per decade, and each one took a long time to crawl out of. If you own bitcoin, you should be able to say “an 80% drawdown is inside the historical range” out loud without flinching. If you can’t say it, the honest response isn’t courage. It’s a smaller position.

The Math That Makes the Sleep Test Honest

The test: hold a position small enough that an 80% decline wouldn’t change your plans, your bills, or your temperament. Here’s what that looks like on a hypothetical $100,000 portfolio:

Bitcoin position	Value at -80%	Dollar loss	Loss as % of portfolio
1% ($1,000)	$200	$800	0.8%
3% ($3,000)	$600	$2,400	2.4%
5% ($5,000)	$1,000	$4,000	4.0%
10% ($10,000)	$2,000	$8,000	8.0%

An 80% drop in a 3% position costs 2.4% of the portfolio — the kind of drawdown a plain stock index fund produces in a bad year. At 10%, you’ve manufactured your own personal bear market inside the bear market, and no amount of conviction helps you hold through that if the dollar amount touches a nerve.

There’s an asymmetry hiding in these numbers too, and it’s the reason selling in a crash is so destructive. To get back to even from a 70% loss, you need a 233% gain (0.30 → 1.00 requires tripling plus a third). From an 80% loss, you need 400%. The deeper the hole, the more the recovery math tilts against you — which is exactly why the decision that matters most happens before the crash, in position sizing, and almost never during it.

The Drawdown Tolerance Exercise

Do this once, tonight, in writing. Three steps, five minutes:

1. Write your current crypto dollar value. The actual number, not the rounded-vibes number.
2. Multiply it by 0.2. That’s your balance after an 80% drawdown, which is inside historical experience.
3. Ask one question about the loss: would the dollar difference between those two numbers change anything that matters — your emergency fund, your timeline, your sleep, a single conversation with your spouse?

If the answer is no, your size is probably sane. If the answer is yes, trim until the answer is no. That’s it. That’s the whole exercise, and it’s worth more than a hundred articles about conviction.

What a Bear Market Tests Instead

The sizing test is what the sleep test actually checks. But there are two secondary tests a real bear market runs, and both can be prepared for:

• The behavior test: at -60%, do you follow a written plan or freeze entirely? Freezing is actually fine — it’s the panic selling that locks losses in. My honest position is that a dollar-cost-averaging schedule written in advance is the best behavior tool I know, which is the argument I make in that post directly: it’s not a math edge, it’s a commitment device.
• The attention test: bear markets turn price-checking into a compulsion. The only real fix is a size small enough that you don’t care. Set a check schedule — monthly for a position like this is plenty — and delete the app from your home screen.

The Rebalance Question, Before the Bear Arrives

One decision worth making in advance: what happens when the position grows? A 3% bitcoin allocation can drift to 6% during a strong run, and suddenly the same 80% drawdown costs more than double the original plan. The fix is mechanical and unemotional — rebalancing bands. If your rule is “hold 3%, rebalance when it drifts beyond 5%,” then a bull market forces you to trim gains and a bear market forces you to top up. Both directions are automatic, and neither requires an opinion about where price is headed.

The math of why this works in a bear market specifically: after a drawdown, the remaining position is smaller, so any rule-driven top-up buys more units per dollar. That’s not a prediction that the asset recovers — it’s just arithmetic on the price you paid versus the price you’re paying now. People who rebalanced through previous cycles describe the same experience: the selling in euphoria felt uncomfortable, the buying in despair felt worse, and both were the reason the position stayed inside the size they could actually hold.

Whatever band you pick, write it down with the position size. A band without a written size becomes a vibe the moment price is down 60%, and vibes are how 3% positions quietly become 12% positions through pure neglect.

A Sizing Framework, Hedged

Not advice — a range to think inside. Plenty of long-term holders land somewhere between 1% and 5% of investable assets, sized so the full 80% haircut is a number they can shrug at. Above that, you’re no longer making an investment decision; you’re making a personality decision about whether you’re the person who can watch -77% without flinching, and most people — including people who are sure they can — are wrong about themselves the first time. The sizing frameworks and rebalancing bands in that post are the practical version of this.

I’m not a financial advisor, bitcoin is volatile, and nothing here is a recommendation to buy or hold it. This is a framework for deciding how much of it you can carry before the next bad stretch arrives — because historically, one always does.

Forward step: run the three-step exercise above and write the two numbers down — what you own, and what it’s worth at -80%. Tape that second number somewhere you’ll see it. Then read the original sleep test post and see whether your written number survives it.