Think of SDEVs as a means to gauge how extended the current price is relative to that time based range, in addition to where price could potentially go without become over extended. They are a map of historical distribution. You will need to figure out the best way to apply this to your trading, Perhaps just start by focusing on one, I would recommend the H4 if you are trading the full AM session, or the H1 if you are only trading a specific hour.