I think clonazepam made me sleepy in the beginning but that wore off. I take it for anxiety. Anxiety itself has always stressed and fatigued me. Before anti-anxiety medication I can't count how many times I had something stressful to do and instead I would just take a nap. Now, I take a regular dose of clonazepam everyday, and if I have to do something very anxiety producing, I can do it with an extra half tablet. I still can be pretty irritable most of the time--but I am not inclined to take a higher dose of clonazepam to see if that helps.