How to avoid getting 'drained'/ tired on comedown?

Well, my adivise to you would be find something to do before you smoke up i findd it works great , cause it sounds like you have kinda the same problem as i do, and this is wut I do before i smoke up. I'll go to gym get my blood going do a few reps then walk outside smoke a joint or two go back inside and keep on working out and still by the time when im done at the gym or which ever activitie you do you'll be still awake and not drowzy at all but at the same time im stoned so yeah, if it helped me it should work for you, like go for a run , bike ride, yoga :D or just sumthin to keep you busy . peace