Is my Baobab going to sleep?

Got this baby Baobab tree from Senegal, West Africa in February. It is now residing with me in Indonesia, SE Asia.

Should I be worried about the leaves turning yellow and dropping?

I was watering it once a week until I read once a month is enough (during it's sleeping time none at all).

Has it started to go to sleep??

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That is an Adenium, not a baobab.

You've got a lot of scale insects on there, you'll want to get them taken care of. They are those little tan spots you see on the leaves. For a plant that small, your easiest means of removing them would be to just wipe them off with a paper towel or a finger.

Describe the medium in which your Adenium is growing. It ought to be very fast-draining. I've killed more than one Adenium by letting it stay too wet for too long. That may in fact be why it is dropping leaves. you may want to try repotting it.