NAS100 doesn't trade the same way all day, and treating every hour like it's equally tradeable is how good setups turn into bad trades. The New York open, roughly the first 30 minutes after the cash market opens, is where the real volume shows up. Institutional orders that built up overnight get executed, and that's what actually moves price with conviction, not the slow drift you see during the Asian session.
The mistake is trading that opening volatility like it's a normal session. Spreads widen, stop hunts happen fast, and a setup that looked clean on the 15-minute chart five minutes before the open can invalidate itself in seconds once real volume hits. If you're newer to NAS100, the better play is often to watch the first 15–20 minutes without a position, let the initial move happen, then look for your setup once price starts respecting a level. You'll give up being first, but you'll stop getting stopped out by noise that has nothing to do with your analysis.