I get so sleepy while i'm at work. am i depressed?

Poor night sleep?: Depression may be a possibility. More important is to look at your overnight sleep: enough sleep time, frequent awakening, snoring, stop breathing, nightmares etc? Any medical disorders such as low thyroid, blood sugar changes. A sleep doctor can help.

Sleepy: Being sleepy could be a symptom of depression, but we have to rule out other causes like sleep apnea, narcolepsy and many other. Talk to your doctor about it.