It'd be my GUESS that the happy dreamy nod has to do with your respiratory system being depressed by drugs that cause euphoria. So if you dont already have that with the methadone it's not gonna make it like that. But if your just awake and alert but high enough to nod if you sat down and chilled out I would think it might work. But remember I don't know and this is just my guess.
I took subutex for 2 weeks and have been opiate free for ike 4 days and I'm having mild withdrawal but it's still aggravating as fuck restless legs and chills. I just took a 10mg methadone so I hope it will help. Prob gonna smoke some MJ in a little bit.
^10 mg will be better than you were i know that.. try taking so benadryl with the methadone it might increase euphoria and maybe a little nod, ive never tried it and defnitely never with dones