I wonder about "prepositional verbs" that comes with Object :
Wake me up.
Wake up me.
Switch the lights off.
Switch off the lights
where should we place the preposition ? after the verb or the object ?
With true phrasal verbs like switch off and wake up, where the object falls depends on the 'weight' of the object. A 'heavy' object (one with many words) falls after the preposition/particle.†.
I switched off [the lights in the upstairs hallway, bedrooms, and staircase].
I woke up [those of my exhausted fellows who had collapsed where they stood].
Putting the preposition/particle after such an object strands it too far from the verb, so both readers and hearers have to grope for the structure.
A medium-weight object may come before or after the preposition/particle.
I switched the overhead lights off. OR I switched off the overhead lights.
I woke John and Ryan up. OR I woke up John and Ryan.
But a very light object, like a single preposition, always comes before the preposition/particle.
I switched it off. BUT NOT *I switched off it.
I woke him up. BUT NOT *I woke up him.
†What you call off and up here varies among grammarians.
These are called as adverbial particles. They have special privilege to fit between the verb and the object noun. I had read it on Swan's PEU.
So, it is preferred this way...
Switch off the light
Switch - verb off - adverbial particle the light - object noun.