Methadone

I have looked almost every where and I cannot find a answer? I know there is one, so please don't tell me to see my counselor, the physician at the clinic they are clueless. In the afternoon after taking 50mg of Methadone and nothing else, I get so sleepy. what can i take to combat this? I work sitting down at a computer and I need to be able to stay awake? I am not overdosing just sleepy? Any suggestions would be a appreciated. what can I take? Emails above