Tips for staying awake during jury duty?

After 23 years, my country has decided that they need me to serve on a jury of my peers.

This is all well and good, I suppose, but college taught me that I could sorta doze off during a lecture while still keeping my ears open – from that point on, I find myself nodding off during lecture-like scenarios. I somehow suspect that this would not be taken well, even if I am still technically awake, and so I beseech you, my fellow Jellies, for your advice.