So tired its painful...sitting at work, what do you do?

So I fell asleep last night at 1 and woke up at 8AM this morning. This is a very early night for me BTW – however I am exhausted, i mean im sitting here yawning my head off and to be honest I almost feel like this is painful. My eyes feel heavy, my body is “slouchy?” and I really just want to lay down and sleep. I don’t like coffee or have any available, however I do have some mountain dew next to me which i am sure will not do a whole lot. What do you do when you feel like this? Surprisingly though I feel rather alert when it comes to understanding things, but slow in response lol