Hugh Grant might need to sip from a chocolate river to pep himself up a bit ... 'cause not even a Wimbledon quarterfinal matchup could seemingly keep the "Wonka" actor awake.
Cameras caught the veteran actor in the stands ... chin resting high on his chest, head cocked slightly to the side.
He's breathing deeply ... and, he's not holding a phone in his hands -- so, he's not just checking his email in between points. Quite frankly, it looks like he's out like a light -- though we can't say for sure.