Whenever I smoke DMT I get really, really tired. Sometimes, while tripping hard, it feels as though my eyes are being forced shut. Can't keep them open if I tried (I have tried). The forcing of the eyes to shut is rare, but I always get dead tired when I come down. Is this because DMT is associated with sleep (in theory), and it is forcing me into a sleep state? Is DMT just physically draining (maybe depleting neurotransmitters)? Is this a common occurrence? Is DMT even related to dreaming? I'd like to hear what ya'll think.