The Friday after Thanksgiving is a shortened session (1pm ET close) with some of the thinnest liquidity of the year, as most institutional desks are empty. That thin tape distorts the dealer map in ways that make normal level-reading unreliable, and it's worth understanding before you trade it.

Why thin liquidity distorts levels

The dealer map's usefulness depends on meaningful participation — levels matter because real flow interacts with them. On a skeleton-crew half-day, that participation is absent: a level can hold on almost no volume simply because nobody's trading, or break on a single modestly-sized order because there's no depth to absorb it. Moves can look dramatic on the chart while representing almost nothing, and the liquidity that normally backs a strike may not be there when you need to exit.

The practical hazards

Spreads are wider, fills are worse, and slippage is higher — the frictions that eat scalping edge are all amplified. A stop can fill far from your level in an air-pocket, and getting out of a 0DTE position at a fair price is harder when there's no one on the other side. The distorted, low-conviction structure means your reads carry less information than usual, even when the chart looks clean.

On the half-day, a held level might just mean nobody showed up. Thin liquidity doesn't make the map stronger — it makes it lie quietly.

The honest recommendation

For most scalpers, the day-after-Thanksgiving half-day is a sit-out day: low, distorted information; poor execution; and an early close that compresses everything. If you do trade it, size down hard, favor only the most liquid strikes, and treat every level with extra skepticism. The seasonal reality is that not every session is worth trading, and this is one where doing nothing is often the highest-EV choice.