Finally something I can speak on lol.
The drug category I think you are referring to is CNS depressants, which slow brain activity and make people relax. The most common are alcohol, benzos, barbiturates and opioids.
CNS stimulant users can also show these signs when coming down from a high, be a use their body and brain is trying to catch up on sleep.
So to answer your question, they are falling asleep.
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