Phenibut might trigger sleepiness and slowed breathing. Some drugs, termed sedatives, also can cause sleepiness and slowed breathing. Having phenibut with sedative drugs could trigger breathing problems and/or a lot of sleepiness. Snooze paralysis - Some end users report the next incidence of encountering rest paralysis immediately after consuming six-APB. https://socialaffluent.com/story4003413/3-mmc-drug-an-overview