My bf has too much energy but im sure its not adhd or add. he can stay up for 3 days without feeling tired. any medical explanation?

Needs medical workup: He needs to get checked out through appropriate physical examination and blood work. Rarely there can be hyperthyroidism causing this sort of deterioration in sleep. Of course, there needs to be a consideration of the possibility of substance abuse. In addition, if these are ruled out then a consideration of mental illness could be made. Stay safe!

Need to rule out bmd: Indeed, staying up for 3 days, without sleeping and having too much energy is usually a sign of mania or substance abuse. Please look up bipolar mood disorder and see if your bf has other sign or symptoms such as talking too fast, spending too much money, being euphoric with increased self esteem or very irritated, starting projects , trouble concentrating. If yes, seek help asap.