Right, there is sleep and then there is deep sleep. AT+SLEEP has 2 modes, light sleep and modem sleep. AT+GSLP is deep sleep (low-power sleep.) Spec sheet sa

Right, there is sleep and then there is deep sleep. AT+SLEEP has 2 modes, light sleep and modem sleep. AT+GSLP is deep sleep (low-power sleep.) Spec sheet says: " A minor adjustment has to be made before the module enter this deep sleep mode, i.e., connect XPD_DCDC with EXT_RSTB via 0 ohm resistor." If you have a scope, check the current draw when you sleep. Surprises can happen depending on the rest of your circuit.