Ive taken nuvigil. Never in an abusive way. It literally just keeps you awake. Small pleasent rush as it comes on but then it just settles in and does its job. Seems to me that your mind feels sharper. Access to memory and ability to do complex tasks ar 30+ hours of awake were not a problem. I would recommend it if u are a night shifter or hardcore college studier. Remember tho these drugs are all schedule 3 therefore running a risk of dependency. Also fucking with your sleep schedule and raging through long term periods of wakefulness can cause hallucinations (not neccesarily a bad thing) and other health risks.