SPDR S&P 500 (SPY)

[USDollar]

if you look at the daily chart there is a true abundance of examples where holding overnight, many overnights, will make the big bucks

so holding overnight is not wrong in itself as per charts

other things can go wrong like strategy

I made good money on the very last big dip holding few nights
I was patient and content with my position to hold it

so maybe trade the charts with a lil extra patience

In my case willy nilly I actually have to hold overnight as I can't babysit