That's strange that you don't to take your ADHD medication because when i was on mine it made me very alert and focused aswell as very wide awake. I barely needed more than 2 hours of sleep a night when i was on it, i honestly survived a whole year without getting more than 6 hours of sleep and i felt fine. I never really ever felt tired, even when i went to bed i wasn't tired. It was like a cup of coffee, like no matter how much sleep i got i just took that and felt wide awake and no crash later. But that was my reaction to what i took, i took concerta but ive never taken any other form of ADHD medication, so maybe some aren't as strong stimulants. I would say be careful about going on and off your meds though, i did that because i was losing tons of weight, and after just a few weeks of not taking my meds everyday i lost it for lack of a better term. I'm sure you'll be fine but i figured since i have experience with this I'd give my 2 cents.