I am not too certain what the psychiatrist means by "complex" and do not wish to make any assumptions.
Are you certain that your son is completely awake during his nightly "fidgeting"? Could it be that he starts out sleep walking, and is then woken up when sent to bed and unable to fall asleep again?
If not, and he is truly waking up full of energy at such an early time, it may be worth while giving him his medication later; if he is able to fall asleep without it, you could wake him up later to take his medication. If he is unable to fall asleep without it, and staying up later in the evening is not an option, a change of medication would be needed.
With regards to him collecting "stuff": this is very typical of his age and the things are viewed as "treasures" by him. Not allowing him to take these to the shops or friends is likely to cause a fight; rather ask him to choose one thing to take with. Safe and unsafe areas to look for things can also be implemented, for example, the garden is safe (if you have a garden area on the farm) while the dustbin is not.
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